swaybar/bg: Fix crash on DPMS off

When turning off displays via DPMS, swaybar and swaybg still tried to
render, but did not get a valid buffer, causing them to crash.

1 files changed, 3 insertions, 0 deletions

diff --git a/swaybar/render.c b/swaybar/render.c
index 2ebd338e..909b56f4 100644
--- a/swaybar/render.c
+++ b/swaybar/render.c
@@ -503,6 +503,9 @@ void render_frame(struct swaybar *bar, struct swaybar_output *output) {
                                 output->buffers,
                                 output->width * output->scale,
                                 output->height * output->scale);
+                if (!output->current_buffer) {
+                        return;
+                }
                 cairo_t *shm = output->current_buffer->cairo;
 
                 cairo_save(shm);