diff --git a/src/sip.c b/src/sip.c
index 32a9264..37162bd 100644
--- a/src/sip.c
+++ b/src/sip.c
@@ -78,6 +78,7 @@ static void new_call(struct sip_agent *agent, nua_handle_t *nh,
 		LOGP(DSIP, LOGL_ERROR, "No supported codec.\n");
 		nua_respond(nh, SIP_406_NOT_ACCEPTABLE, TAG_END());
 		nua_handle_destroy(nh);
+		return;
 	}
 
 	nua_respond(nh, SIP_501_NOT_IMPLEMENTED, TAG_END());