diff --git a/www/js/interface.js b/www/js/interface.js
index 22e6849..dfa6f18 100644
--- a/www/js/interface.js
+++ b/www/js/interface.js
@@ -257,6 +257,8 @@ const INTERFACE = {
     },
 
     draw() {
+        if(INTERFACE_DATA === null) return;
+
         let canvas = INTERFACE_DATA.canvas;
         let ctx = INTERFACE_DATA.context;