[Flask] Multiple signals sent by got_request_exception

[Fredrik Blomqvist]

Hello,

I'm dealing with an odd bug where multiple signals are being sent by
got_request_exception. I'm at a loss on how to debug this. It is the same
amount every time an exception occurs: 3. I have checked the list of
receivers and it is always just 1, which is correct. The receiver is
connected using the "connect" method.

If anyone can give me any advice on what could be wrong I'd be grateful!
I'm running the latest Flask (1.0) on Python 3.6. I have verified that it's
not a bug since it doesn't happen in a small example app.

Best,
Fredrik
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