Issue #2419399 by eurotrash: Undefined property Notice

unused_modules.module

@@ -294,7 +294,7 @@ function _unused_modules_add_project_path(&$modules) {
     // Determine common basepath by looking for needle "/<project>/" in uri.
     // As a fallback use the shortest path method.
     foreach ($project as $module) {
-      if ($module->error !== TRUE) {
+      if (isset($module->error) && $module->error !== TRUE) {
         $needle = "/" . $module->project . "/";
         $before_needle = TRUE;
         $project_path = strstr($module->uri, $needle, $before_needle) . "/" . $module->project;