diff --git a/src/blocks/scratch3_looks.js b/src/blocks/scratch3_looks.js
index e04c5cc15..7954d0660 100644
--- a/src/blocks/scratch3_looks.js
+++ b/src/blocks/scratch3_looks.js
@@ -20,7 +20,7 @@ class Scratch3LooksBlocks {
          */
         this.runtime = runtime;
 
-        this._onTargetMoved = this._onTargetMoved.bind(this);
+        this._onTargetChanged = this._onTargetChanged.bind(this);
         this._onResetBubbles = this._onResetBubbles.bind(this);
         this._onTargetWillExit = this._onTargetWillExit.bind(this);
         this._updateBubble = this._updateBubble.bind(this);
@@ -75,7 +75,7 @@ class Scratch3LooksBlocks {
      * @param {RenderedTarget} target - the target which has moved.
      * @private
      */
-    _onTargetMoved (target) {
+    _onTargetChanged (target) {
         const bubbleState = this._getBubbleState(target);
         if (bubbleState.drawableId) {
             this._positionBubble(target);
@@ -97,7 +97,7 @@ class Scratch3LooksBlocks {
             bubbleState.drawableVisible = true; // Reset back to default value
             this.runtime.requestRedraw();
         }
-        target.removeListener(RenderedTarget.EVENT_TARGET_MOVED, this._onTargetMoved);
+        target.removeListener(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this._onTargetChanged);
     }
 
     /**
@@ -117,9 +117,22 @@ class Scratch3LooksBlocks {
      * @private
      */
     _positionBubble (target) {
+        if (!target.visible) return;
         const bubbleState = this._getBubbleState(target);
         const [bubbleWidth, bubbleHeight] = this.runtime.renderer.getCurrentSkinSize(bubbleState.drawableId);
-        const targetBounds = target.getBoundsForBubble();
+        let targetBounds;
+        try {
+            targetBounds = target.getBoundsForBubble();
+        } catch (error_) {
+            // Bounds calculation could fail (e.g. on empty costumes), in that case
+            // use the x/y position of the target.
+            targetBounds = {
+                left: target.x,
+                right: target.x,
+                top: target.y,
+                bottom: target.y
+            };
+        }
         const stageBounds = this.runtime.getTargetForStage().getBounds();
         if (bubbleState.onSpriteRight && bubbleWidth + targetBounds.right > stageBounds.right &&
             (targetBounds.left - bubbleWidth > stageBounds.left)) { // Only flip if it would fit
@@ -178,7 +191,7 @@ class Scratch3LooksBlocks {
                 this.runtime.renderer.updateTextSkin(bubbleState.skinId, type, text, onSpriteRight, [0, 0]);
             }
         } else {
-            target.addListener(RenderedTarget.EVENT_TARGET_MOVED, this._onTargetMoved);
+            target.addListener(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this._onTargetChanged);
 
             // TODO is there a way to figure out before rendering whether to default left or right?
             const targetBounds = target.getBounds();
diff --git a/src/sprites/rendered-target.js b/src/sprites/rendered-target.js
index 19489d575..c87f3fd72 100644
--- a/src/sprites/rendered-target.js
+++ b/src/sprites/rendered-target.js
@@ -193,6 +193,14 @@ class RenderedTarget extends Target {
         return 'TARGET_MOVED';
     }
 
+    /**
+     * Event which fires when a target changes visually, for updating say bubbles.
+     * @type {string}
+     */
+    static get EVENT_TARGET_VISUAL_CHANGE () {
+        return 'EVENT_TARGET_VISUAL_CHANGE';
+    }
+
     /**
      * Rotation style for "all around"/spinning.
      * @type {string}
@@ -249,6 +257,7 @@ class RenderedTarget extends Target {
                 position: position
             });
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         } else {
@@ -299,6 +308,7 @@ class RenderedTarget extends Target {
                 scale: renderedDirectionScale.scale
             });
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -346,6 +356,7 @@ class RenderedTarget extends Target {
                 visible: this.visible
             });
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -378,6 +389,7 @@ class RenderedTarget extends Target {
                 scale: renderedDirectionScale.scale
             });
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -397,6 +409,7 @@ class RenderedTarget extends Target {
             props[effectName] = this.effects[effectName];
             this.renderer.updateDrawableProperties(this.drawableID, props);
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -413,6 +426,7 @@ class RenderedTarget extends Target {
         if (this.renderer) {
             this.renderer.updateDrawableProperties(this.drawableID, this.effects);
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -446,6 +460,7 @@ class RenderedTarget extends Target {
             }
             this.renderer.updateDrawableProperties(this.drawableID, drawableProperties);
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -573,6 +588,7 @@ class RenderedTarget extends Target {
                 scale: renderedDirectionScale.scale
             });
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -645,6 +661,7 @@ class RenderedTarget extends Target {
             }
             this.renderer.updateDrawableProperties(this.drawableID, props);
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }
@@ -1034,6 +1051,7 @@ class RenderedTarget extends Target {
         if (this.renderer && this.drawableID !== null) {
             this.renderer.destroyDrawable(this.drawableID);
             if (this.visible) {
+                this.emit(RenderedTarget.EVENT_TARGET_VISUAL_CHANGE, this);
                 this.runtime.requestRedraw();
             }
         }