After package my multiplayer game every time I change the character weapon the game breaks. I can not understand the problem. Can someone help me?

Development Programming & Scripting Blueprint
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1

Here the log:

[2019.09.14-02.36.15:171][ 97]LogWindows: Error: === Critical error: ===
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: 
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: Fatal error!
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: 
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: 
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Core.dll!0x00000000C1E18C62
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-CoreUObject.dll!0x00000000C190B192
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-CoreUObject.dll!0x00000000C190AF46
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A865666D
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A865192B
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A86447EE
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A865269C
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A8656DCC
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A8655D20
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A8656B35
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A8B40E5E
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A8B41F91
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-OnlineSubsystemUtils.dll!0x00000000B71542E4
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A8B1FC2F
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A7FA1788
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-Engine.dll!0x00000000A89CA234
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-UnrealEd.dll!0x00000000BFEAC982
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor-UnrealEd.dll!0x00000000C073D646
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor.exe!0x00000000FC11534A
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor.exe!0x00000000FC123970
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor.exe!0x00000000FC1239EA
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor.exe!0x00000000FC1302D9
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: UE4Editor.exe!0x00000000FC131C47
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: KERNEL32.DLL!0x0000000026BC7BD4
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: ntdll.dll!0x0000000027FECEE1
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: ntdll.dll!0x0000000027FECEE1
[2019.09.14-02.36.15:171][ 97]LogWindows: Error: 
[2019.09.14-02.36.15:186][ 97]LogExit: Executing StaticShutdownAfterError
[2019.09.14-02.36.15:190][ 97]LogWindows: FPlatformMisc::RequestExit(1)
[2019.09.14-02.36.15:190][ 97]Log file closed, 09/13/19 23:36:15
2

This is a null Pointer exception. The Same AS you See in unpackaged Game AS “acessed None” - so you try to acess a variable/Pointer which is Not Set/Points to null