diff --git a/filemanager/inc/class.filemanager_hooks.inc.php b/filemanager/inc/class.filemanager_hooks.inc.php
index 3557495930..af44a039fb 100644
--- a/filemanager/inc/class.filemanager_hooks.inc.php
+++ b/filemanager/inc/class.filemanager_hooks.inc.php
@@ -234,15 +234,21 @@ class filemanager_hooks
 		}
 		$editorLink = self::getEditorLink();
 		$mimes = array();
-		foreach ($editorLink['mime'] as $mime => $value)
-		{
-			$mimes[$mime] = lang('%1 file', strtoupper($value['ext'])).' ('.$mime.')';
 
-			if (!empty($value['extra_extensions']))
+		if (is_array($editorLink['mime'])){
+
+			foreach ($editorLink['mime'] as $mime => $value)
 			{
-				$mimes[$mime] .= ', '.strtoupper(implode(', ', $value['extra_extensions']));
+				$mimes[$mime] = lang('%1 file', strtoupper($value['ext'])).' ('.$mime.')';
+
+				if (!empty($value['extra_extensions']))
+				{
+					$mimes[$mime] .= ', '.strtoupper(implode(', ', $value['extra_extensions']));
+				}
 			}
+
 		}
+
 		$merge_open_handler = array ('download' => lang('download'), 'collabora' => 'Collabora');
 		$document_doubleclick_action = array (
 			'collabora' => lang('open documents with Collabora, if permissions are given'),