Hi! I’m sure this is a bug since I tried this three times, once by accident and the other two to check.
When you want to search (pressing the glass icon), two text entries appear (among other things), search and replace. If you only type in the replace entry and accidentally hit Enter, Gdevelop crashes. I think it would be better if it just didn’t let you replace it, and a text appeared saying that you have to enter something to replace it in the first place.
Thanks for reporting. 
I’ll forward to the devs.
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Fixed for the next version, thanks for the bug report!