diff --git a/Classes/Controller/ModuleController.php b/Classes/Controller/ModuleController.php
index 323f836f..bd684936 100644
--- a/Classes/Controller/ModuleController.php
+++ b/Classes/Controller/ModuleController.php
@@ -552,7 +552,7 @@ public function ajaxGroupsImport(ServerRequestInterface $request): ResponseInter
 			// Merge LDAP and TYPO3 information
 			$group = Authentication::merge($ldapGroup, $typo3Groups[0], $config['groups']['mapping']);
 
-			if ((int)$group['uid'] === 0) {
+			if (((int)$group['uid'] ?? 0) === 0) {
 				$group = Typo3GroupRepository::add($table, $group);
 			} else {
 				// Restore group that may have been previously deleted