@ClockworkOcean
There is no function in the callstack created by OP. If it was, one of those symbols would have a meaningful name and it would come from his project’s dll. So he is NOT the one trying to read from and empty array. It’s an issue with the Engine/Editor
@ArkCreator
Did you write any actual C++ code or is your project blueprint-only?
Do you know what causes this issue (reproduction steps)?
If it’s an issue caused by a faulty blueprint node, you may find a blueprint backtrace in the log, right before this whole message appears…
…and there might be some useful warnings/errors in the log besides the callstack.
You can copy-paste WHOLE log here, if you don’t know what to look for.
The callstack alone does not tell anything useful because you don’t have debug symbols (that’s why it says UnknownFunction everywhere).
The error Assertion failed: (Index >= 0) & (Index < ArrayNum) is meaningless because we don’t know what have led to it happening. We need more context.