Index: path_redirect.module
===================================================================
--- path_redirect.module	(wersja 8769)
+++ path_redirect.module	(kopia robocza)
@@ -548,7 +548,11 @@
   $sql = 'DELETE FROM {path_redirect} WHERE ' . implode(' AND ', $query['conditions']);
   db_query($sql, $query['args']);
   $deleted = db_affected_rows();
-  path_redirect_clear_cache();
+
+  // Clean cache only when something was removed.
+  if ($deleted > 0) {
+    path_redirect_clear_cache();
+  }
   return $deleted;
 }