```
PHP Notice: Undefined index: 1 in /srv/mediawiki/php-1.32.0-wmf.19/extensions/AbuseFilter/includes/AbuseFilter.php on line 928
```
```name=trace
#0 /srv/mediawiki/php-1.32.0-wmf.19/extensions/AbuseFilter/includes/AbuseFilter.php(928): MWExceptionHandler::handleError(integer, string, string, integer, array, array)
#1 /srv/mediawiki/php-1.32.0-wmf.19/extensions/AbuseFilter/includes/AbuseFilter.php(1187): AbuseFilter::executeFilterActions(array, Title, AbuseFilterVariableHolder)
#2 /srv/mediawiki/php-1.32.0-wmf.19/extensions/AbuseFilter/includes/AbuseFilterHooks.php(123): AbuseFilter::filterAction(AbuseFilterVariableHolder, Title)
#3 /srv/mediawiki/php-1.32.0-wmf.19/extensions/AbuseFilter/includes/AbuseFilterHooks.php(58): AbuseFilterHooks::filterEdit(RequestContext, WikitextContent, string, Status, string, boolean)
#4 /srv/mediawiki/php-1.32.0-wmf.19/includes/Hooks.php(174): AbuseFilterHooks::onEditFilterMergedContent(RequestContext, WikitextContent, Status, string, User, boolean)
#5 /srv/mediawiki/php-1.32.0-wmf.19/includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL)
#6 /srv/mediawiki/php-1.32.0-wmf.19/includes/EditPage.php(1719): Hooks::run(string, array)
#7 /srv/mediawiki/php-1.32.0-wmf.19/includes/EditPage.php(2163): EditPage->runPostMergeFilters(WikitextContent, Status, User)
#8 /srv/mediawiki/php-1.32.0-wmf.19/includes/EditPage.php(1546): EditPage->internalAttemptSave(NULL, boolean)
#9 /srv/mediawiki/php-1.32.0-wmf.19/includes/api/ApiEditPage.php(392): EditPage->attemptSave(NULL)
#10 /srv/mediawiki/php-1.32.0-wmf.19/includes/api/ApiMain.php(1587): ApiEditPage->execute()
#11 /srv/mediawiki/php-1.32.0-wmf.19/includes/api/ApiMain.php(531): ApiMain->executeAction()
#12 /srv/mediawiki/php-1.32.0-wmf.19/includes/api/ApiMain.php(502): ApiMain->executeActionWithErrorHandling()
#13 /srv/mediawiki/php-1.32.0-wmf.19/api.php(87): ApiMain->execute()
#14 /srv/mediawiki/w/api.php(3): include(string)
#15 {main}
```
Source:
<https://github.com/wikimedia/mediawiki-extensions-AbuseFilter/blob/b0bf8b0e154ce03d2496dd136fa05dd74d3f27f9/includes/AbuseFilter.php#L928>:
```lang=php
foreach ( $actionsByFilter as $filter => $actions ) {
# line 928:
list( $rateCount, $ratePeriod ) = explode( ',', array_shift( $parameters ) );