diff --git a/src/blocks/scratch3_sensing.js b/src/blocks/scratch3_sensing.js
index 8dbd95d6c..2b031307c 100644
--- a/src/blocks/scratch3_sensing.js
+++ b/src/blocks/scratch3_sensing.js
@@ -44,6 +44,7 @@ class Scratch3SensingBlocks {
         this.runtime.on('PROJECT_START', this._resetAnswer.bind(this));
         this.runtime.on('PROJECT_STOP_ALL', this._clearAllQuestions.bind(this));
         this.runtime.on('STOP_FOR_TARGET', this._clearTargetQuestions.bind(this));
+        this.runtime.on('RUNTIME_DISPOSED', this._resetAnswer.bind(this));
     }
 
     /**