From 07e412c53829c66e948eb147873a04cd27b0771b Mon Sep 17 00:00:00 2001
From: Fred Sundvik <fsundvik@gmail.com>
Date: Tue, 17 May 2016 11:21:38 +0300
Subject: [PATCH] Fix crash when event listener not created

---
 visualizer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/visualizer.c b/visualizer.c
index ea84546fb6..ff99e960fd 100644
--- a/visualizer.c
+++ b/visualizer.c
@@ -458,7 +458,9 @@ void visualizer_init(void) {
 void update_status(bool changed) {
     if (changed) {
         GSourceListener* listener = geventGetSourceListener(layer_changed_event, NULL);
-        geventSendEvent(listener);
+        if (listener) {
+            geventSendEvent(listener);
+        }
     }
 #ifdef USE_SERIAL_LINK
     static systime_t last_update = 0;