From a7f4fc22126800740389a313dd895670071da69f Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Thu, 12 Jul 2018 14:41:28 -0400
Subject: [PATCH] Microbit write bails out if not connected

---
 src/extensions/scratch3_microbit/index.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/extensions/scratch3_microbit/index.js b/src/extensions/scratch3_microbit/index.js
index 19451725a..16d8eebbd 100644
--- a/src/extensions/scratch3_microbit/index.js
+++ b/src/extensions/scratch3_microbit/index.js
@@ -250,6 +250,7 @@ class MicroBit {
      * @private
      */
     _writeSessionData (command, message) {
+        if (!this.getPeripheralIsConnected()) return;
         const output = new Uint8Array(message.length + 1);
         output[0] = command; // attach command to beginning of message
         for (let i = 0; i < message.length; i++) {