TYPO3 Core

Thanks for the bug report! Are there any specific steps for duplicating this issue? Does the Javascript error occur all the time and in all browsers for you?

The problem seems to occur sporadic, but I will investigate it further.

I've finally found a way to duplicate this...ironically enough, its using the wec_devo extension (from my company).

The extension inserts a ton of JS directly into the page and "</head>" is part of the JS that is inserted. This causes the header insertion in index_ts.php to fail.

$TSFE->content = str_ireplace('</head>', $BE_USER->adminPanel->getAdminPanelHeaderData() . '</head>', $TSFE->content);