output: check wlr_output in repaint handler

It's possible for the output to be disconnected in just the right moment
for wlr_output to be NULL in the repaint handler, causing a crash. This
check fixes that crash.

1 files changed, 4 insertions, 0 deletions

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 6498198b..dea087c6 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -508,6 +508,10 @@ static bool scan_out_fullscreen_view(struct sway_output *output,
 
 int output_repaint_timer_handler(void *data) {
         struct sway_output *output = data;
+        if (output->wlr_output == NULL) {
+                return 0;
+        }
+
         output->wlr_output->block_idle_frame = false;
 
         struct sway_workspace *workspace = output->current.active_workspace;