diff --git a/os_trace.c b/os_trace.c
index ae4b94f..efb720a 100644
--- a/os_trace.c
+++ b/os_trace.c
@@ -293,6 +293,7 @@ static bool trace_channel_exec(user_t *u, void *q)
 	trace_query_channel_domain_t *domain = (trace_query_channel_domain_t *) q;
 
 	return_val_if_fail(domain != NULL, false);
+	return_val_if_fail(domain->channel != NULL, false);
 	return_val_if_fail(u != NULL, false);
 
 	return (chanuser_find(domain->channel, u) != NULL);