TypeError: Cannot read properties of undefined (reading 'innerHTML')
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	bwang
	Jan 12 2023, 5:50 PM

Description

normalized_message

TypeError: Cannot read properties of undefined (reading 'innerHTML')

exception.trace

~650 errors in the past 24 hours

I can find a single innerHTML in the DiscussionTools codebase outrside of tests: https://phabricator.wikimedia.org/diffusion/EDTO/browse/master/modules/utils.js$37. This doesn't look like it can be the one in the error message. I tagged it anyway to get something started. Please feel free to remove.

Another file mentioned on logstash is one in the user namespace: https://bn.wikipedia.org/wiki/User:Yahya/সুরক্ষা_স্তর_শনাক্তকারী.js. There is a innerHTML at the bottom that makes assumptions about the mw-indicators section being there.

It can't be that line in DiscussionTools, since if node was undefined there, it would have already thrown an exception on previous lines.

Here's a working Logstash query: https://logstash.wikimedia.org/goto/b2ffac5cb153eb9fbefdccca2ff4477f (I relaxed the search terms a bit to also find error messages from other browsers)

It looks like it's limited to a couple of wikis, so this error is probably several different errors in default gadgets.

For the records, I reported a few obvious ones to their authors (but a lot of items in Logstash have anonymous stacktraces):