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-rw-r--r--backend/multi/backend.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/backend/multi/backend.c b/backend/multi/backend.c
index 2309691d..b06bc486 100644
--- a/backend/multi/backend.c
+++ b/backend/multi/backend.c
@@ -189,6 +189,9 @@ static struct subbackend_state *multi_backend_get_subbackend(struct wlr_multi_ba
bool wlr_multi_backend_add(struct wlr_backend *_multi,
struct wlr_backend *backend) {
+ assert(_multi && backend);
+ assert(_multi != backend);
+
struct wlr_multi_backend *multi = multi_backend_from_backend(_multi);
if (multi_backend_get_subbackend(multi, backend)) {