How to track down the source of warning/error

All of a sudden, I’m getting lines in the output like this every time I use the PIE:


LogUObjectArray: Warning: Invalid object index -842150451
LogUObjectArray: Warning: Invalid object index -842150451
LogUObjectArray: Warning: Invalid object index -842150451
LogUObjectArray: Warning: Invalid object index -572662307
LogUObjectArray: Warning: Invalid object index -572662307

But since it doesn’t tell me where this error is coming from (which class/object), I have no idea whether it’s a serious issue, nor how to fix it. Obviously it could start stripping things out of the project to figure it out, but I’m hoping there’s an easier way to find out what object is causing this warning.

How can I track down what’s going on here?

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