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-rw-r--r--sway/tree/container.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sway/tree/container.c b/sway/tree/container.c
index 435d71e2..45e54080 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -769,7 +769,7 @@ void container_for_each_descendant(struct sway_container *container,
bool container_has_ancestor(struct sway_container *descendant,
struct sway_container *ancestor) {
- while (descendant->type != C_ROOT) {
+ while (descendant && descendant->type != C_ROOT) {
descendant = descendant->parent;
if (descendant == ancestor) {
return true;