TYPO3 Exception 1444996537¶

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This error happens since TYPO3 7.6 if your extension has defined the TCA in the file Configuration/TCA/my_extension_table.php and when "'displayCond' => 'EXT:foreign_extension:LOADED:true'" is used.

see Bug #76958: displayCond LOADED does not check the loaded extension

You must move the the column with the condition into the folder Configuration/TCA/Overrides of your extension (my_extension) or of the foreign extension (foreign_extension) or of a third connector extension like my_extension_connector. There you must use condition

if (\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::isLoaded('foreign_extension')) {
   $temporaryColumns = array (
     'my_field_for_foreign_extension' => array (

in the file Configuration/TCA/Overrides/my_extension_table.php around the part where the column is defined.