diff --git a/apps/swiperclocklaunch/boot.js b/apps/swiperclocklaunch/boot.js
index 0bb8d588a..0a4e617e1 100644
--- a/apps/swiperclocklaunch/boot.js
+++ b/apps/swiperclocklaunch/boot.js
@@ -3,7 +3,7 @@
     var sui = Bangle.setUI;
     Bangle.setUI = function(mode, cb) {
         sui(mode,cb);
-        if (!mode.startsWith("clock")) return;
+        if (mode && !mode.startsWith("clock")) return;
         Bangle.swipeHandler = dir => { if (dir<0) Bangle.showLauncher(); };
         Bangle.on("swipe", Bangle.swipeHandler);
     };
@@ -14,4 +14,4 @@ setTimeout(function() {
         Bangle.swipeHandler = dir => { if (dir>0) load(); };
         Bangle.on("swipe", Bangle.swipeHandler);
     }
-}, 10);
\ No newline at end of file
+}, 10);