TYPO3 Core

commit: 1cbc440

I get Notice: Undefined index: TYPO3\CMS\Backend\Utility\BackendUtility::getUpdateSignal in path\to\typo3\sysext\core\Classes\Authentication\AbstractUserAuthentication.php on line 1308

While xdebugging, I did notice that getModuleData() was called and a class with method name was passed in here (according to the current master of afa3e7f8285f4e30a8a4fbc163fdf616b4e43b80 )
https://github.com/TYPO3/TYPO3.CMS/blob/master/typo3/sysext/backend/Classes/Utility/BackendUtility.php#L2912

But looking at that method, $this->uc['moduleSessionID'][$module] is called where $module is the class and method name string, but $this->uc['moduleSessionID'] doesn't seem to have any keys in that format (e.g. in this case: 'TYPO3\CMS\Backend\Utility\BackendUtility::getUpdateSignal'), but rather in a short strings such as 'lang'
https://github.com/TYPO3/TYPO3.CMS/blob/master/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php#L1308