diff --git a/js/activity.js b/js/activity.js
index 1fa535ab5..cd9e0351a 100644
--- a/js/activity.js
+++ b/js/activity.js
@@ -1961,7 +1961,7 @@ class Activity {
                     that.stageX = event.stageX;
                     that.stageY = event.stageY;
     
-                    if (!that.moving) return;
+                    if (!moving) return;
 
                     // if we are moving the block container, deselect the active block.
                     // Deselect active block if moving the block container