# \#null **URL:** https://forums.unrealengine.com/tag/null/921.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [AnimNotifyState becomes NULL after restart and in package.](https://forums.unrealengine.com/t/animnotifystate-becomes-null-after-restart-and-in-package/2701194)
**Author:** [@NielsTheDutchOne](https://forums.unrealengine.com/u/NielsTheDutchOne)\ **Replies:** 0\ **Last updated:** [February 20, 2026, 2:41pm UTC](https://forums.unrealengine.com/t/animnotifystate-becomes-null-after-restart-and-in-package/2701194 "2026-02-20T14:41:34Z")
(Using 5.4) Behold, the two images. First is an animation montage that has the weapontrail, which I use for the VFX and the code to trace the weapon’s movement for an attack. After restarting the editor, the notifystat… --- ## [How do I clear a variable?](https://forums.unrealengine.com/t/how-do-i-clear-a-variable/281142)
**Author:** [@anonymous\_user\_80025496](https://forums.unrealengine.com/u/anonymous_user_80025496)\ **Replies:** 15\ **Last updated:** [May 20, 2025, 5:41pm UTC](https://forums.unrealengine.com/t/how-do-i-clear-a-variable/281142 "2025-05-20T17:41:58Z")
Very sorry if this has been asked before, but I couldn’t find an answer. How do I set a variable to nothing/nil/null/none etc? Scenario: I set a variable on an actor when it collides with another actor, I want to clear… --- ## [Multiple Device Malfunctions: Class Selector, × Capture Area Device! × Teleporter, and Mutator, trackers, and More which Fail to Work Upon Private & Public Publication / Intermittenly in Editor](https://forums.unrealengine.com/t/multiple-device-malfunctions-class-selector-x-capture-area-device-x-teleporter-and-mutator-trackers-and-more-which-fail-to-work-upon-private-public-publication-intermittenly-in-editor/1723890)
**Author:** [@PledgedRanger](https://forums.unrealengine.com/u/PledgedRanger)\ **Replies:** 10\ **Last updated:** [April 16, 2024, 11:29pm UTC](https://forums.unrealengine.com/t/multiple-device-malfunctions-class-selector-x-capture-area-device-x-teleporter-and-mutator-trackers-and-more-which-fail-to-work-upon-private-public-publication-intermittenly-in-editor/1723890 "2024-04-16T23:29:27Z")
Reference ID a697fafc-4880-661a-6dde-01a50a47ef02 Please select what you are reporting on: Unreal Editor for Fortnite What Type of Bug are you experiencing? Devices Summary There seem to be several issues with the fun… --- ## [Object created with "CreateDefaultSubobject" null after copying blueprint asset in editor](https://forums.unrealengine.com/t/object-created-with-createdefaultsubobject-null-after-copying-blueprint-asset-in-editor/1711587)
**Author:** [@Joost](https://forums.unrealengine.com/u/Joost)\ **Replies:** 1\ **Last updated:** [February 25, 2024, 1:29pm UTC](https://forums.unrealengine.com/t/object-created-with-createdefaultsubobject-null-after-copying-blueprint-asset-in-editor/1711587 "2024-02-25T13:29:13Z")
I have an AttributeSet object that gets created in my character’s constructor. If I duplicate a child blueprint asset, the AttributeSet is always null in the copy. If I rename the variable and rebuild my project that fi… --- ## [Accessed None Trying to Read Property "ItemObject"](https://forums.unrealengine.com/t/accessed-none-trying-to-read-property-itemobject/1693969)
**Author:** [@IITheRatKingII](https://forums.unrealengine.com/u/IITheRatKingII)\ **Replies:** 9\ **Last updated:** [February 19, 2024, 3:24pm UTC](https://forums.unrealengine.com/t/accessed-none-trying-to-read-property-itemobject/1693969 "2024-02-19T15:24:55Z")
I am trying to make a multiplayer inventory system, and right now I am running into trouble when trying to drop an item from the inventory. I have everything SO CLOSE to working but there is just one issue. When trying t… --- ## [C++ Interface Cast returns NULL when implemented with Editor](https://forums.unrealengine.com/t/c-interface-cast-returns-null-when-implemented-with-editor/334784)
**Author:** [@Ghar](https://forums.unrealengine.com/u/Ghar)\ **Replies:** 9\ **Last updated:** [December 22, 2023, 1:22pm UTC](https://forums.unrealengine.com/t/c-interface-cast-returns-null-when-implemented-with-editor/334784 "2023-12-22T13:22:53Z")
Hello. I made an Interface that should be able to be implemented in both code and Blueprints. This is the Interface: InterfaceCoversArea.h UINTERFACE() class UInterfaceCoversArea : public UInterface { GENERATED\_UINTE… --- ## [Critical Issue with UEFN engine, Null, String, Not Found](https://forums.unrealengine.com/t/critical-issue-with-uefn-engine-null-string-not-found/1361947)
**Author:** [@PledgedRanger](https://forums.unrealengine.com/u/PledgedRanger)\ **Replies:** 0\ **Last updated:** [November 4, 2023, 6:55am UTC](https://forums.unrealengine.com/t/critical-issue-with-uefn-engine-null-string-not-found/1361947 "2023-11-04T06:55:40Z")
Reference ID f6764ac0-4001-2f61-c9ff-01b087c30a64 Please select what you are reporting on: Unreal Editor for Fortnite What Type of Bug are you experiencing? Stability Summary Reference ID f6764ac0-4001-2f61-c9ff-01b08… --- ## [Why do my widget's components become None when I make a child class from it?](https://forums.unrealengine.com/t/why-do-my-widgets-components-become-none-when-i-make-a-child-class-from-it/1317176)
**Author:** [@heyx3](https://forums.unrealengine.com/u/heyx3)\ **Replies:** 0\ **Last updated:** [September 30, 2023, 1:16am UTC](https://forums.unrealengine.com/t/why-do-my-widgets-components-become-none-when-i-make-a-child-class-from-it/1317176 "2023-09-30T01:16:16Z")
I’ve got a custom widget that owns an Image component, and in PreConstruct does some stuff to it. I then make another Blueprint, derived from the widget type. In that Blueprint, I do not add or change anything. It’s an … --- ## [How to fix up object stuck at NULL in blueprint?](https://forums.unrealengine.com/t/how-to-fix-up-object-stuck-at-null-in-blueprint/484221)
**Author:** [@jwatte](https://forums.unrealengine.com/u/jwatte)\ **Replies:** 2\ **Last updated:** [September 18, 2022, 8:29pm UTC](https://forums.unrealengine.com/t/how-to-fix-up-object-stuck-at-null-in-blueprint/484221 "2022-09-18T20:29:38Z")
I have a character subclass. It creates an AbilitySystemComponent, and a custom AttributeSet. The AttributeSet is assigned to a member variable named Attributes which used to just be a UPROPERTY() but is now EditAnywher… --- ## [Behavior tree is coming as null ptr](https://forums.unrealengine.com/t/behavior-tree-is-coming-as-null-ptr/490229)
**Author:** [@i\_am\_burni](https://forums.unrealengine.com/u/i_am_burni)\ **Replies:** 0\ **Last updated:** [October 25, 2021, 1:12pm UTC](https://forums.unrealengine.com/t/behavior-tree-is-coming-as-null-ptr/490229 "2021-10-25T13:12:47Z")
hi i am experiencing the same problem as please help they havent cleared the problem --- ## [Call a method on server spawned actor on all clients](https://forums.unrealengine.com/t/call-a-method-on-server-spawned-actor-on-all-clients/490015)
**Author:** [@TheKing530](https://forums.unrealengine.com/u/TheKing530)\ **Replies:** 2\ **Last updated:** [October 20, 2021, 4:38am UTC](https://forums.unrealengine.com/t/call-a-method-on-server-spawned-actor-on-all-clients/490015 "2021-10-20T04:38:49Z")
Hello all! Bit of an interesting question. I’ve got the following setup for an item use system (think Skyrim/Fallout style): Client controlling a Pawn opens their inventory (UI) and presses a button for an item. UI ca… --- ## [Array item in SaveFile turns NULL](https://forums.unrealengine.com/t/array-item-in-savefile-turns-null/486197)
**Author:** [@Sutano\_Izamura](https://forums.unrealengine.com/u/Sutano_Izamura)\ **Replies:** 1\ **Last updated:** [October 1, 2021, 11:08pm UTC](https://forums.unrealengine.com/t/array-item-in-savefile-turns-null/486197 "2021-10-01T23:08:41Z")
Hello devs. Sorry for bothering you but I really do not know what is happening right here Can someone explain to me how it is possible that a variable which is in SaveGame FIle becomes NULL after a certain time? (Time i… --- ## [NULL CharacterMovement component when switching from custom back to default](https://forums.unrealengine.com/t/null-charactermovement-component-when-switching-from-custom-back-to-default/407101)
**Author:** [@tlaelgames](https://forums.unrealengine.com/u/tlaelgames)\ **Replies:** 3\ **Last updated:** [September 8, 2021, 8:58am UTC](https://forums.unrealengine.com/t/null-charactermovement-component-when-switching-from-custom-back-to-default/407101 "2021-09-08T08:58:28Z")
NULL CharacterMovement component when switching from custom back to default Build Type: Binary Build Version: Version: 4.17.2-3658906+++UE4+Release-4.17 When using a custom CharacterMovementComponent for the ACharact… --- ## [Hard object reference to DataAsset is sometimes null in packaged build](https://forums.unrealengine.com/t/hard-object-reference-to-dataasset-is-sometimes-null-in-packaged-build/475966)
**Author:** [@nullObjectPtr](https://forums.unrealengine.com/u/nullObjectPtr)\ **Replies:** 6\ **Last updated:** [August 19, 2021, 1:11am UTC](https://forums.unrealengine.com/t/hard-object-reference-to-dataasset-is-sometimes-null-in-packaged-build/475966 "2021-08-19T01:11:50Z")
We are seeing problems with some actors in our levels that have Hard Object References to DataAssets. The references to the DataAsset references are showing up as null on occasion on cooked builds but never in the editor… --- ## [Failed to spawn player controller, GameSession is null](https://forums.unrealengine.com/t/failed-to-spawn-player-controller-gamesession-is-null/478831)
**Author:** [@byalexeykh](https://forums.unrealengine.com/u/byalexeykh)\ **Replies:** 5\ **Last updated:** [May 19, 2021, 8:14am UTC](https://forums.unrealengine.com/t/failed-to-spawn-player-controller-gamesession-is-null/478831 "2021-05-19T08:14:21Z")
I moved the map files to another folder, after that this error appeared. I have no idea what might be causing it. As you can see in the screenshot, all settings are set, why GameSession is null - I have no idea. --- ## [unreal material instance dynamic null,unreal material dynamic null](https://forums.unrealengine.com/t/unreal-material-instance-dynamic-null-unreal-material-dynamic-null/482112)
**Author:** [@Anonymous\_b7e44f6b0a68ecdd15bb9f2efe5a8ba5](https://forums.unrealengine.com/u/Anonymous_b7e44f6b0a68ecdd15bb9f2efe5a8ba5)\ **Replies:** 0\ **Last updated:** [April 18, 2021, 1:38pm UTC](https://forums.unrealengine.com/t/unreal-material-instance-dynamic-null-unreal-material-dynamic-null/482112 "2021-04-18T13:38:23Z")
When using material instance dynamic with code, it is used in such a way that GetDynamic is performed on the image and saved, then the parameter value is retrieved and a cap is inserted. However, when you build, sometime… --- ## [Intentionally setting StaticMeshComponent's mesh to null doesn't affect replicated clients](https://forums.unrealengine.com/t/intentionally-setting-staticmeshcomponents-mesh-to-null-doesnt-affect-replicated-clients/320050)
**Author:** [@anonymous\_user\_f778e888](https://forums.unrealengine.com/u/anonymous_user_f778e888)\ **Replies:** 3\ **Last updated:** [March 3, 2021, 10:08pm UTC](https://forums.unrealengine.com/t/intentionally-setting-staticmeshcomponents-mesh-to-null-doesnt-affect-replicated-clients/320050 "2021-03-03T22:08:05Z")
Setting the mesh to null on the server works, but when the value is replicated to clients it gets ignored. The problem is that OnRep\_StaticMesh() sets StaticMesh to NULL before it calls SetStaticMesh(NewStaticMesh). In… --- ## [Accessed none on actor reference that is getting passed around.](https://forums.unrealengine.com/t/accessed-none-on-actor-reference-that-is-getting-passed-around/362118)
**Author:** [@esquire](https://forums.unrealengine.com/u/esquire)\ **Replies:** 1\ **Last updated:** [June 27, 2016, 1:10pm UTC](https://forums.unrealengine.com/t/accessed-none-on-actor-reference-that-is-getting-passed-around/362118 "2016-06-27T13:10:47Z")
So I’m about to lose it. I took some time to plan out the logic for a sort of persistent weapon stash/loadout system. I feel like this is something pretty simple, but so far my efforts have proved useless. I can spawn a… --- ## [用Spwan AIFrom Class 节点生成的蓝图 和 Spwan ActorFromClass节点生成的蓝图在 运行游戏时 行为树中的Event Receive Execute returns PAWN却是空的？](https://forums.unrealengine.com/t/spwan-aifrom-class-spwan-actorfromclass-event-receive-execute-returns-pawn/455956)
**Author:** [@Sakick](https://forums.unrealengine.com/u/Sakick)\ **Replies:** 0\ **Last updated:** [September 25, 2019, 2:30pm UTC](https://forums.unrealengine.com/t/spwan-aifrom-class-spwan-actorfromclass-event-receive-execute-returns-pawn/455956 "2019-09-25T14:30:48Z")
我用放置的方式放置蓝图在关卡中然后运行游戏时 行为树中的Event Receive Execute returns PAWN 为有值 非空。 我用Spwan AIFrom Class 节点生成的蓝图 和 Spwan ActorFromClass节点生成的蓝图在 运行游戏时 行为树中的Event Receive Execute returns PAWN却是空的？不知道是什么原因？ --- ## [TSubclassOf returning null](https://forums.unrealengine.com/t/tsubclassof-returning-null/449896)
**Author:** [@kranatos13](https://forums.unrealengine.com/u/kranatos13)\ **Replies:** 1\ **Last updated:** [June 1, 2019, 6:50am UTC](https://forums.unrealengine.com/t/tsubclassof-returning-null/449896 "2019-06-01T06:50:06Z")
So I am trying to move my widgets into C++ and a HUD. I have tried watching a tutorial to get this set up though it doesn’t seem to be working for me. I set my widgets in the HUD BP using TSubclassOf and then select them… --- ## [\[FEATURE REQUEST\] Null Blueprint Node](https://forums.unrealengine.com/t/feature-request-null-blueprint-node/390257)
**Author:** [@markdrew](https://forums.unrealengine.com/u/markdrew)\ **Replies:** 2\ **Last updated:** [May 8, 2019, 3:35pm UTC](https://forums.unrealengine.com/t/feature-request-null-blueprint-node/390257 "2019-05-08T15:35:32Z")
I realise how I can unset a variable in a blueprint, but this leads to confusion when you are reading the otherwise wonderful world of blueprints. Did I forget to connect something? or is this item purposely null? I… --- ## [Seamless traveling when joining sessions](https://forums.unrealengine.com/t/seamless-traveling-when-joining-sessions/446242)
**Author:** [@broly](https://forums.unrealengine.com/u/broly)\ **Replies:** 0\ **Last updated:** [March 29, 2019, 4:14pm UTC](https://forums.unrealengine.com/t/seamless-traveling-when-joining-sessions/446242 "2019-03-29T16:14:49Z")
I need to Seamless Travel using online sessions. While ClientTravel is working when passing parameters TravelType and bSeamless, the JoinSession has no same parameters. I tried to hack that by overriding ClientTravelIn… --- ## [Sequencer crash (access violation)](https://forums.unrealengine.com/t/sequencer-crash-access-violation/441832)
**Author:** [@Alykkaat\_Palvelu](https://forums.unrealengine.com/u/Alykkaat_Palvelu)\ **Replies:** 1\ **Last updated:** [February 13, 2019, 4:02am UTC](https://forums.unrealengine.com/t/sequencer-crash-access-violation/441832 "2019-02-13T04:02:54Z")
Hello everyone, We are trying to finish up our small project and we need to record two vehicles to create a sequence for the end product. But since lately we get a random access violation error/crash. I have specified t… --- ## [Get Streaming Level Return Null](https://forums.unrealengine.com/t/get-streaming-level-return-null/441550)
**Author:** [@Dreaghy](https://forums.unrealengine.com/u/Dreaghy)\ **Replies:** 1\ **Last updated:** [January 18, 2019, 10:52am UTC](https://forums.unrealengine.com/t/get-streaming-level-return-null/441550 "2019-01-18T10:52:06Z")
Hello. When I use “Get streaming level” node it returns Null. I’ve used “Get current level name” then “Get streaming level” and “Is level loaded” nodes. And I get an error message “Accessed None trying to read propert… --- ## [Blueprints derived from c++ classes not updating properly](https://forums.unrealengine.com/t/blueprints-derived-from-c-classes-not-updating-properly/339771)
**Author:** [@toilari](https://forums.unrealengine.com/u/toilari)\ **Replies:** 3\ **Last updated:** [October 16, 2018, 5:06am UTC](https://forums.unrealengine.com/t/blueprints-derived-from-c-classes-not-updating-properly/339771 "2018-10-16T05:06:07Z")
Branch: Binary Build Version: 4.10.0-2758231 Description: It seems that in some cases blueprints are not getting updated after hot-reloads (or their variables are not initialized to accommodate new variables or change… --- ## [UPROPERTY is null](https://forums.unrealengine.com/t/uproperty-is-null/429984)
**Author:** [@Vetril](https://forums.unrealengine.com/u/Vetril)\ **Replies:** 0\ **Last updated:** [July 22, 2018, 9:46am UTC](https://forums.unrealengine.com/t/uproperty-is-null/429984 "2018-07-22T09:46:09Z")
Hi guys, I’m trying to pass to a class that extends UButton a TSubclassOf UPROPERTY that points to a BP class. I then use this UPROPERTY to construct an instance through NewObject. The problem I am having right now is … --- ## [Same pointer is valid in BP but null in C++](https://forums.unrealengine.com/t/same-pointer-is-valid-in-bp-but-null-in-c/423903)
**Author:** [@Arty-McLabin](https://forums.unrealengine.com/u/Arty-McLabin)\ **Replies:** 19\ **Last updated:** [May 14, 2018, 10:53am UTC](https://forums.unrealengine.com/t/same-pointer-is-valid-in-bp-but-null-in-c/423903 "2018-05-14T10:53:33Z")
The next uproperty component pointer: UPROPERTY(VisibleAnywhere, BlueprintReadWrite) USkeletalMeshComponent\* mesh; constructor code: mesh = CreateDefaultSubobject\(TEXT("mesh")); //succeeds all … --- ## [ConvertRenderTargetToTexture2DEditorOnly: Texture must be non-null.](https://forums.unrealengine.com/t/convertrendertargettotexture2deditoronly-texture-must-be-non-null/421124)
**Author:** [@Storm\_Foreshadow](https://forums.unrealengine.com/u/Storm_Foreshadow)\ **Replies:** 0\ **Last updated:** [March 28, 2018, 4:49pm UTC](https://forums.unrealengine.com/t/convertrendertargettotexture2deditoronly-texture-must-be-non-null/421124 "2018-03-28T16:49:35Z")
Hi I’m trying to conver RenderTarget to Texture2D with ConvertRenderTargetToTexture2DEditorOnly node, but when I run it It says Blueprint: Warning: ConvertRenderTargetToTexture2DEditorOnly: Texture must be non-null. … --- ## [When spawning a c++ Actor from blueprint, why is the GetOwner and GetInstigator null?](https://forums.unrealengine.com/t/when-spawning-a-c-actor-from-blueprint-why-is-the-getowner-and-getinstigator-null/362039)
**Author:** [@anonymous\_user\_84e009961](https://forums.unrealengine.com/u/anonymous_user_84e009961)\ **Replies:** 1\ **Last updated:** [February 14, 2018, 4:55pm UTC](https://forums.unrealengine.com/t/when-spawning-a-c-actor-from-blueprint-why-is-the-getowner-and-getinstigator-null/362039 "2018-02-14T16:55:41Z")
I have recently began the journey of learning the c++ ways, and am converting my various knowledge of blueprints into c++. My current ‘Non Homing Projectile’ is simple. It is meant to be a spawn and travel in the direct… --- ## [Cannot join server hosted over VPN emulated LAN](https://forums.unrealengine.com/t/cannot-join-server-hosted-over-vpn-emulated-lan/410252)
**Author:** [@Harth\_Tuwist](https://forums.unrealengine.com/u/Harth_Tuwist)\ **Replies:** 1\ **Last updated:** [December 21, 2017, 8:00pm UTC](https://forums.unrealengine.com/t/cannot-join-server-hosted-over-vpn-emulated-lan/410252 "2017-12-21T20:00:28Z")
Hello Folks, I tried testing a build of my game this weekend over Evolve (Hamachi but actually working) with a friend of mine, the session handling code of the project corresponds to that of the Multiplayer Shootout exa… [Next page](https://forums.unrealengine.com/tag/null/921.md?match_all_tags=true&page=1&tags%5B%5D=null)