Hello Halki,
This is most likely not a bug and is an error with your project, due to the “array out of bounds” message. The callstack that you are receiving is incomplete and does not have the proper information for anyone to assist you. Please use the Epic Games Launcher, click the Library tab, click the arrow beside “Launch” under your current engine version, Select the Options button and check the box for “Editor symbols for debugging”. This will allow for the callstack to be displayed properly instead of just listing “UnknownFunction”.
Also, in general, to receive assistance with issues like this, it would be best to provide that callstack alongside the logs from the project. You can find these logs in the project’s folder under Saved/Logs.
Edit: There is also no reason to hide your LoginID/EpicAccountID. It is not useful for anyone but our staff members.