Fix crash when moving workspace to output

1 files changed, 3 insertions, 1 deletions

diff --git a/sway/tree/layout.c b/sway/tree/layout.c
index 197a2fc8..1f898f8a 100644
--- a/sway/tree/layout.c
+++ b/sway/tree/layout.c
@@ -232,7 +232,9 @@ void container_move_to(struct sway_container *container,
         }
         if (new_workspace != old_workspace) {
                 workspace_detect_urgent(new_workspace);
-                workspace_detect_urgent(old_workspace);
+                if (old_workspace) {
+                        workspace_detect_urgent(old_workspace);
+                }
         }
 }