TYPO3 Core

For full backtrac you have to wait until tomorrow but it is called here:
https://git.typo3.org/Packages/TYPO3.CMS.git/blob/HEAD:/typo3/sysext/backend/Classes/Form/Element/AbstractFormElement.php#l700

Which is e.g. called here:
https://git.typo3.org/Packages/TYPO3.CMS.git/blob/HEAD:/typo3/sysext/backend/Classes/Form/Element/GroupElement.php

So if there is an element which calls that method in the IRRE record this fails :)

Can confirm that for current master. Happens when I'm in Quick Edit mode on a page containing the felogin plugin.
Backtrace:

1. Time Memory Function Location
   1 0.0038 242240 {main}( ) .../index.php:0
   2 0.8973 243936 call_user_func:{/var/www/typo3git/typo3_src/typo3/index.php:21} ( ? ) .../index.php:21
   3 0.8974 243976 {closure:/var/www/typo3git/typo3_src/typo3/index.php:18-21}( ) .../index.php:21
   4 0.9185 3733632 TYPO3\CMS\Backend\Http\Application->run( ? ) .../index.php:20
   5 0.9185 3733744 TYPO3\CMS\Core\Core\Bootstrap->handleRequest( ? ) .../Application.php:94
   6 0.9189 3755072 TYPO3\CMS\Backend\Http\BackendModuleRequestHandler->handleRequest( ? ) .../Bootstrap.php:302
   7 0.9791 8454992 TYPO3\CMS\Backend\Http\BackendModuleRequestHandler->dispatchModule( ? ) .../BackendModuleRequestHandler.php:92
   8 0.9809 8502208 TYPO3\CMS\Core\Http\Dispatcher->dispatch( ?, ? ) .../BackendModuleRequestHandler.php:195
   9 0.9813 8529984 call_user_func_array:{/var/www/typo3git/typo3_src/typo3/sysext/core/Classes/Http/Dispatcher.php:41} ( ?, ? ) .../Dispatcher.php:41
   10 0.9813 8530144 TYPO3\CMS\Backend\Controller\PageLayoutController->mainAction( ?, ? ) .../Dispatcher.php:41
   11 1.0695 9690216 TYPO3\CMS\Backend\Controller\PageLayoutController->main( ) .../PageLayoutController.php:559
   12 1.0903 10116144 TYPO3\CMS\Backend\Controller\PageLayoutController->renderQuickEdit( ) .../PageLayoutController.php:647
   13 1.2742 11499784 TYPO3\CMS\Backend\Form\Container\OuterWrapContainer->render( ) .../PageLayoutController.php:784
   14 1.2746 11515968 TYPO3\CMS\Backend\Form\Container\FullRecordContainer->render( ) .../OuterWrapContainer.php:54
   15 1.2751 11537872 TYPO3\CMS\Backend\Form\Container\TabsContainer->render( ) .../FullRecordContainer.php:84
   16 1.3753 11910904 TYPO3\CMS\Backend\Form\Container\PaletteAndSingleContainer->render( ) .../TabsContainer.php:90
   17 1.3754 11924032 TYPO3\CMS\Backend\Form\Container\SingleFieldContainer->render( ) .../PaletteAndSingleContainer.php:136
   18 1.3764 11944288 TYPO3\CMS\Backend\Form\Container\FlexFormEntryContainer->render( ) .../SingleFieldContainer.php:163
   19 1.3767 11961816 TYPO3\CMS\Backend\Form\Container\FlexFormTabsContainer->render( ) .../FlexFormEntryContainer.php:44
   20 1.3772 11986944 TYPO3\CMS\Backend\Form\Container\FlexFormElementContainer->render( ) .../FlexFormTabsContainer.php:84
   21 1.3792 12034120 TYPO3\CMS\Backend\Form\Element\GroupElement->render( ) .../FlexFormElementContainer.php:135
   22 1.3850 12281344 TYPO3\CMS\Backend\Form\Element\AbstractFormElement->dbFileIcons( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ) .../GroupElement.php:310

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/44116

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/44116

Patch set 4 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/44116