From 2269e0cfcf974c0c00cec8e9ff48dbfbab98c363 Mon Sep 17 00:00:00 2001
From: Vincent Koc <vincentkoc@ieee.org>
Date: Fri, 31 Jul 2026 05:26:29 +0800
Subject: [PATCH] fix(voice-call): guard synchronous realtime close

---
 extensions/voice-call/src/webhook/realtime-handler.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/extensions/voice-call/src/webhook/realtime-handler.ts b/extensions/voice-call/src/webhook/realtime-handler.ts
index 8585f10c5886..781419a89ad7 100644
--- a/extensions/voice-call/src/webhook/realtime-handler.ts
+++ b/extensions/voice-call/src/webhook/realtime-handler.ts
@@ -752,6 +752,8 @@ export class RealtimeCallHandler {
       typeof this.providerConfig.interruptResponseOnInputAudio === "boolean"
         ? this.providerConfig.interruptResponseOnInputAudio
         : undefined;
+    // Providers may close synchronously before createBridge returns; no consult can exist yet.
+    let nativeConsultOwner: ActiveRealtimeVoiceBridge | undefined;
     const session = harness.createBridge({
       provider: this.realtimeProvider,
       cfg: this.coreConfig,
@@ -935,7 +937,9 @@ export class RealtimeCallHandler {
         this.activeBridgesByCallId.delete(callSid);
         this.activeTelephonyClosersByCallId.delete(callId);
         this.activeTelephonyClosersByCallId.delete(callSid);
-        this.cancelNativeConsult(callId, session);
+        if (nativeConsultOwner) {
+          this.cancelNativeConsult(callId, nativeConsultOwner);
+        }
         this.clearUserTranscriptState(callId);
         harness.finishOutputAudio(reason);
         harness.emit({
@@ -961,6 +965,7 @@ export class RealtimeCallHandler {
           });
       },
     });
+    nativeConsultOwner = session;
     providerHandlesInputAudioBargeIn =
       session.bridge.handlesInputAudioBargeIn ?? providerHandlesInputAudioBargeIn;
     const closeTelephony = (reason: TelephonyCloseReason) => {