@Sitrash1
Thank you, but this also means, I need to go through all ForEachLoops in my blueprint to check, if it is valid, right?
I understand, that this would be a good solution for every ForEachLoop and I should do that in the future, but I still don’t get how UE doesn’t “want” to share the information with me, which array is the problem, to make the debugging more efficient.