diff --git a/ui/vnc.c b/ui/vnc.c
index 01b2daf..656895a 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1055,7 +1055,9 @@ static void vnc_disconnect_finish(VncState *vs)
     vnc_unlock_output(vs);
 
     qemu_mutex_destroy(&vs->output_mutex);
-    qemu_bh_delete(vs->bh);
+    if (vs->bh != NULL) {
+        qemu_bh_delete(vs->bh);
+    }
     buffer_free(&vs->jobs_buffer);
 
     for (i = 0; i < VNC_STAT_ROWS; ++i) {