diff --git a/libobs/obs.c b/libobs/obs.c
index c4fcf7407..bd0128f4d 100644
--- a/libobs/obs.c
+++ b/libobs/obs.c
@@ -777,6 +777,7 @@ bool obs_add_source(obs_source_t source)
 	struct calldata params = {0};
 
 	if (!obs) return false;
+	if (!source) return false;
 
 	pthread_mutex_lock(&obs->data.sources_mutex);
 	da_push_back(obs->data.user_sources, &source);