diff --git a/app/packages/looker/src/overlays/detection.ts b/app/packages/looker/src/overlays/detection.ts
index 1298cf2fbc..e8616f71b1 100644
--- a/app/packages/looker/src/overlays/detection.ts
+++ b/app/packages/looker/src/overlays/detection.ts
@@ -263,7 +263,6 @@ export default class DetectionOverlay<
 
   public cleanup(): void {
     this.label.mask?.bitmap?.close();
-    this.label.mask.bitmap = null;
   }
 }
 
diff --git a/app/packages/looker/src/overlays/heatmap.ts b/app/packages/looker/src/overlays/heatmap.ts
index b9e41e1a9c..d8fb8909d5 100644
--- a/app/packages/looker/src/overlays/heatmap.ts
+++ b/app/packages/looker/src/overlays/heatmap.ts
@@ -208,7 +208,6 @@ export default class HeatmapOverlay<State extends BaseState>
 
   public cleanup(): void {
     this.label.map?.bitmap?.close();
-    this.label.map.bitmap = null;
   }
 }
 
diff --git a/app/packages/looker/src/overlays/segmentation.ts b/app/packages/looker/src/overlays/segmentation.ts
index 566a7153b0..04c2fc693b 100644
--- a/app/packages/looker/src/overlays/segmentation.ts
+++ b/app/packages/looker/src/overlays/segmentation.ts
@@ -263,7 +263,6 @@ export default class SegmentationOverlay<State extends BaseState>
 
   public cleanup(): void {
     this.label.mask?.bitmap?.close();
-    this.label.mask.bitmap = null;
   }
 }