Whats the reason for "Renaming an object on top of an existing object" exception?

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Aha. Its true that the trailTrigger Event Graph contains this:

Event Actor Begin Overlap - Cast to trailActor …

(and trailActor is the blueprint if i modify, and hit Run, then it crashes)

Could this be the reason?

Thanks.

Or the reason is in Construction script of another third blueprint, which constructs trailTriggers automatically, but it is strange, that technically it works (for example after editor crash, if i hit play)

L.