diff --git a/core/block_dragger.ts b/core/block_dragger.ts
index 1cab37053..e6be29391 100644
--- a/core/block_dragger.ts
+++ b/core/block_dragger.ts
@@ -382,6 +382,7 @@ export class BlockDragger implements IBlockDragger {
 
     blockAnimation.disconnectUiStop();
     this.connectionPreviewer.hidePreview();
+    this.connectionPreviewer.dispose();
 
     const preventMove =
       !!this.dragTarget_ &&