diff --git a/src/call.c b/src/call.c
index 194a7db87..7ae8a9234 100644
--- a/src/call.c
+++ b/src/call.c
@@ -2296,6 +2296,9 @@ int call_accept(struct call *call, struct sipsess_sock *sess_sock,
 
 bool call_sess_cmp(const struct call *call, const struct sip_msg *msg)
 {
+	if (!call || !msg)
+		return false;
+
 	return sipsess_msg_equal(call->sess, msg);
 }
 
diff --git a/src/ua.c b/src/ua.c
index 216457bf4..acc4aec0e 100644
--- a/src/ua.c
+++ b/src/ua.c
@@ -803,7 +803,7 @@ int ua_accept(struct ua *ua, const struct sip_msg *msg)
 		return EINVAL;
 
 	if (ua_find_call_msg(ua, msg)) {
-		warning("ua: call was already accepted\n");
+		warning("ua: call was already created\n");
 		return EINVAL;
 	}