diff --git a/src/filewidgets/urlutil_p.h b/src/filewidgets/urlutil_p.h
--- a/src/filewidgets/urlutil_p.h
+++ b/src/filewidgets/urlutil_p.h
@@ -70,7 +70,9 @@
         // e.g. this would just be ok:
         // childPath  = /home/a   len=7
         // parentPath = /home     len=5
-        Q_ASSERT(childPath.length() >= (parentPath.length() + 2));
+        if (childPath.length() < (parentPath.length() + 2) ) {
+            return QUrl();
+        }

         const int idx2 = childPath.indexOf(QLatin1Char('/'), parentPath.length() + 2);
         // parentPath = /home