From eca66e9ddebebd5398e459a8bc40a5d0b5ae33b1 Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Tue, 9 Jan 2018 19:22:33 -0500
Subject: [PATCH] Check for runtime

---
 src/blocks/scratch3_sound.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/blocks/scratch3_sound.js b/src/blocks/scratch3_sound.js
index 48d25dde9..1d7cfa239 100644
--- a/src/blocks/scratch3_sound.js
+++ b/src/blocks/scratch3_sound.js
@@ -18,7 +18,9 @@ class Scratch3SoundBlocks {
         }
 
         this._onTargetCreated = this._onTargetCreated.bind(this);
-        runtime.on('targetWasCreated', this._onTargetCreated);
+        if (this.runtime) {
+            runtime.on('targetWasCreated', this._onTargetCreated);
+        }
     }
 
     /**