--- pam_skey-1.1.5-orig/pam_skey.c
+++ pam_skey-1.1.5/pam_skey.c
@@ -248,7 +248,8 @@
         conv->appdata_ptr)
     != PAM_SUCCESS)
   {
-    _pam_delete(presponse->resp);
+    if (presponse != NULL)
+      _pam_delete(presponse->resp);
     return PAM_SERVICE_ERR;
   }