Casting to character in BT Task causing crash

ItsBenji90 · March 17, 2015, 3:01pm

This is an issue that is only happening while using 4.7.2 back in 4.6 it worked fine.

Here is my enemies attacking behaviour tree task.
In this image the bits that I have highlighted seem to be making the game crash as soon as they are executed. The ‘cast to mycharacter’ seems to work fine, but when i want to use it to do a custom event/change the player health the game (PIE and packaged) just crashes

Also is there a better way for enemies to deal a specific amount of damage to the character?

MieszkoZ · March 17, 2015, 3:31pm

Do you happen to have any callstack or log file for this crash?

Cheers,

–

ItsBenji90 · March 17, 2015, 3:55pm

Where do I find the log files?
Thought it might have been here D:\Program Files\Unreal Projects\Overdosed 4.7\Saved\Logs but can’t seem to find anything in the many log files.

Also would it be better to see the crash report for the packaged game version? You’ll have to tell me where that is too.

MieszkoZ · March 17, 2015, 4:15pm

PIE would be preferable and just repro the crash, copy-paste here any info that pops up and attach the newest of logs in the Logs directory.

ItsBenji90 · March 17, 2015, 6:34pm

This is what came up in the crash reporter: MachineId:44A2C4BF4A2F1FCF81BD7AB524AB0251EpicAccountId:b072f3e306ab4edb9c0e02 - Pastebin.com
This is the latest log file: Log file open, 03/17/15 18:22:05LogInit:Display: Running engine for game: Over - Pastebin.com

and this is on 4.7.3 too

Justin.Dooley · March 18, 2015, 1:54pm

It looks like it’s the characters health that is breaking it.

‘MyCharacter_C_0’ is of class ‘MyCharacter_C’ however property ‘FloatProperty_1323’ belongs to class ‘TRASHCLASS_MyCharacter_675’

anonymous_user_9b155d6f · March 19, 2015, 2:29am

We were having a similar issue today. In an enemy BT we had a task for attacking the player, and inside of that all we were doing was finding the player My_Character, casting it to My Character, and subtracting health from the player. It would crash straight after the cast.

We are running a streaming perforce server which may be the cause of the issues. After it started crashing, we would just delete in the BT ‘get player health’ and ‘subtract damage’ nodes. We would remake those exact 2 nodes with the same values and it would fix the problem. Once we check the blueprint back in and checked it out again and re-ran the project again, we would get the crash again.

One work-around we did was created a function inside the NPC Blueprint, and inside the task we would call that function to subtract the health. I hope this helps you in some way.

We are using 4.7.3 as well.

ItsBenji90 · March 19, 2015, 11:29am

Just tried your work-around and it works! No crashing!

Thanks so much for the suggestion.

ItsBenji90 · March 19, 2015, 12:00pm

well actually that didn’t last long…
It’s crashing again but now it’s showing this in the logs:

‘Devourer_C_0’ is of class ‘Devourer_C’ however property ‘BoolProperty_1839’ belongs to class ‘TRASHCLASS_Devourer_879’

(Devourer is my enemy NPC)

Seems to be something to do with trashclass but can’t seem to find what this is

anonymous_user_759e5c3a · March 19, 2015, 6:51pm

Hi LazyGames,

Our Blueprint developers were able to find and fix a bug that seems to cause this symptom. The fix is scheduled for the 4.7.4 hotfix. They would like to have a copy of your project just to double-check, so if you would like, we can do that.

Cheers!

ItsBenji90 · March 19, 2015, 8:35pm

The project is a bit too big for me to upload atm (even when compressed)
I’ll wait for 4.7.4 Thanks.

anonymous_user_759e5c3a · March 19, 2015, 8:45pm

Alrighty, please let us know if it does not fix the problem and we will continue the investigation.

Cheers!

anonymous_user_9b155d6f · March 19, 2015, 11:32pm

Boo.Ours is still running fine luckily enough haha. Well at least now we know it could be a bug and hopefully gets fixed

anonymous_user_f54268a3 · April 13, 2015, 9:47pm

I am experiencing this same crash. In 4.7.5. Cast to MyCharacter class in Behavior Tree Task crashes. I am able to cast to Character, so it is just the cast to my new one.

Edit: As a note, remaking a new BT Task from scratch is working now.

anonymous_user_759e5c3a · April 15, 2015, 3:12pm

Hi ,

Just to be clear, you are saying if you recreate the BT Task, then it works fine again? Can you post the crash callstack and log just so that we can be certain it’s the same? Just on the off this is a similar, but different issue.

Thank you.

willh313_1 · April 17, 2015, 5:03am

Hello my game is experiencing a similar problem and I was wondering if I could get your help. Please notify me if you help me out with this problem.

willh313_1 · April 17, 2015, 5:20am

Hello ,
My game is experiencing a similar problem and I was wondering if I could get your help. Please notify me if you can help me out with this problem.

anonymous_user_759e5c3a · April 17, 2015, 12:58pm

Hi Willh313,

If you are experiencing this same issue, please provide more details for it here such as the crash callstack and logs. If you have a similar, but different issue, please post it as a new question to the Bug Reports section of the AnswerHub.

Cheers!

willh313_1 · April 17, 2015, 6:27pm

I actually fixed by moving up to 7.5 as the thread suggested. Thanks for your quick response though. I really appreciate it.