diff --git a/src/ol/render/canvas/ExecutorGroup.js b/src/ol/render/canvas/ExecutorGroup.js
index 6180223528..ea28923ee6 100644
--- a/src/ol/render/canvas/ExecutorGroup.js
+++ b/src/ol/render/canvas/ExecutorGroup.js
@@ -82,7 +82,7 @@ class ExecutorGroup extends Disposable {
      * @private
      * @type {CanvasRenderingContext2D}
      */
-    this.hitDetectionContext_;
+    this.hitDetectionContext_ = null;
 
     /**
      * @private