--- a/lib/misc.c	2020-05-24 11:11:32.867925303 +0530
+++ b/lib/misc.c	2020-05-24 11:12:22.136929746 +0530
@@ -143,6 +143,8 @@
        tempchar;
   struct passwd *pw;
 
+  g_return_val_if_fail(src != NULL, NULL);
+
   pw = NULL;
   str = g_strdup (src);