diff --git a/web/js/panzoom.js b/web/js/panzoom.js
index d8034ad83..fdbe3b4e0 100644
--- a/web/js/panzoom.js
+++ b/web/js/panzoom.js
@@ -175,6 +175,7 @@ var zmPanZoom = {
   },
 
   setTouchAction: function(el) {
+    if (!el) return;
     const currentScale = el.getScale().toFixed(1);
     if (currentScale == 1) {
       el.setOptions({touchAction: 'manipulation'});