Caught a syntax error: unrecognized expression: #!

Just caught this in my logs:

Uncaught Error: Syntax error, unrecognized expression: #!
Line: 1
Column: 26848
Window Location:!



I am not sure what to do with this report, what it the actual issue the end user is experiencing? This is very possible due to a plugin.

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Feel free to flag to be reopened if this happens again.