Merge pull request #1634 from irgsmirx/patch-6

Update/Bugfix lib/files/cache/legacy.php during database upgrade

lib/files/cache/legacy.php

@@ -51,6 +51,12 @@ class Legacy {
 			$this->cacheHasItems = false;
 			return false;
 		}
+		
+		if ($result === false || property_exists($result, 'error_message_prefix')) {
+			$this->cacheHasItems = false;
+			return false;
+		}		
+		
 		$this->cacheHasItems = (bool)$result->fetchRow();
 		return $this->cacheHasItems;
 	}