diff --git a/src/xpath.c b/src/xpath.c
index 26aa168..d07a10e 100644
--- a/src/xpath.c
+++ b/src/xpath.c
@@ -1565,7 +1565,7 @@
     ly_err_free(err);
     if (rc) {
         /* invalid value */
-        free(str);
+        /* function store automaticaly dealloc value when fail */
         goto fill;
     }