diff --git a/web/source/osk/visualKeyboard.ts b/web/source/osk/visualKeyboard.ts
index 24c6937b7c..96879d3010 100644
--- a/web/source/osk/visualKeyboard.ts
+++ b/web/source/osk/visualKeyboard.ts
@@ -1212,7 +1212,7 @@ namespace com.keyman.osk {
         let height = (this.kbdDiv.firstChild as HTMLElement).offsetHeight; // firstChild == layer-group, has height info.
         // We need to adjust the offset properties by any offsets related to the active banner.
 
-        var yMin = (_Box) ? Math.max(5, this.kbdDiv.offsetTop + _Box.offsetTop - 0.25*height) : 5;
+        var yMin = (this.kbdDiv && _Box) ? Math.max(5, this.kbdDiv.offsetTop + _Box.offsetTop - 0.25*height) : 5;
         if(key0 && e.touches[0].pageY < yMin) {
           this.highlightKey(key0,false);
           this.showKeyTip(null,false);