From c4774b988a017f23ef15d3e22893943d4906e8ae Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Wed, 4 Mar 2026 14:26:03 +0000
Subject: [PATCH] Fix null _queue race condition in uart.js write()

bindUser() sets _mode on line 50 but creates _queue on line 71. If
write() is called between these two points (e.g. during reconnection),
the mode check passes but _queue is still null, causing a crash. Add
a null guard for _queue in the write() condition.

https://claude.ai/code/session_01HkebHixb3ASRumcrKYRD8p
---
 lib/uart.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/uart.js b/lib/uart.js
index a142c18..0912bc1 100644
--- a/lib/uart.js
+++ b/lib/uart.js
@@ -235,7 +235,7 @@ class BluetoothHciSocket extends EventEmitter {
 
   write (data) {
     debug(`Write: ${data.toString('hex')}`);
-    if (this._mode === 'raw' || this._mode === 'user') {
+    if ((this._mode === 'raw' || this._mode === 'user') && this._queue) {
       this._queue.push(data);
     }
   }