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"Unknown error occurred" message when checking AbuseFilter syntax on MediaWiki 1.29
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Description

On thetestwiki.org which is running MediaWiki version 1.29 - whenever a user clicks the "check syntax" button when modifying abuse filter conditions, it says "an unknown error occurred" regardless of the changes. This happens when pressing the button for a general test filter with no conditions, and for other filters where the conditions are obviously valid because the filter works. See the screenshot of the general test filter below.

IMG_1274.PNG (1×2 px, 200 KB)

Event Timeline

MacFan4000 added a subscriber: MacFan4000.

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