diff --git a/src/mod/endpoints/mod_sofia/sofia.c b/src/mod/endpoints/mod_sofia/sofia.c
index d3a3edb95b..6a991e8ca9 100644
--- a/src/mod/endpoints/mod_sofia/sofia.c
+++ b/src/mod/endpoints/mod_sofia/sofia.c
@@ -4451,7 +4451,7 @@ void sofia_handle_sip_i_refer(nua_t *nua, sofia_profile_t *profile, nua_handle_t
 									moh = tmp;
 								}
 								
-								if (moh && !strcasecmp(moh, "silence")) {
+								if (!zstr(moh) && !strcasecmp(moh, "silence")) {
 									moh = NULL;
 								}