From 4fd3c848de3d1e8fb77652bfe1511e39b37fe329 Mon Sep 17 00:00:00 2001
From: Hiroshi Horie <548776+hiroshihorie@users.noreply.github.com>
Date: Fri, 27 Feb 2026 03:38:27 +0900
Subject: [PATCH 1/4] fix

---
 lib/src/track/audio_visualizer_native.dart | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/src/track/audio_visualizer_native.dart b/lib/src/track/audio_visualizer_native.dart
index a7ed37692..926049c45 100644
--- a/lib/src/track/audio_visualizer_native.dart
+++ b/lib/src/track/audio_visualizer_native.dart
@@ -53,11 +53,13 @@ class AudioVisualizerNative extends AudioVisualizer {
       return;
     }
 
-    await Native.stopVisualizer(mediaStreamTrack.id!, visualizerId: visualizerId);
-
+    // Cancel subscription before native stop, otherwise the native
+    // StreamHandler is already removed and cancel throws MissingPluginException.
     await _streamSubscription?.cancel();
     _streamSubscription = null;
     _eventChannel = null;
+
+    await Native.stopVisualizer(mediaStreamTrack.id!, visualizerId: visualizerId);
   }
 }
 

From 73961ecc313aa527c5c8bb2a7b2aa1d9ca1e0966 Mon Sep 17 00:00:00 2001
From: Hiroshi Horie <548776+hiroshihorie@users.noreply.github.com>
Date: Fri, 27 Feb 2026 03:45:58 +0900
Subject: [PATCH 2/4] fix ios

---
 shared_swift/LiveKitPlugin.swift | 1 +
 shared_swift/Visualizer.swift    | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/shared_swift/LiveKitPlugin.swift b/shared_swift/LiveKitPlugin.swift
index 8d11d9ef3..a2d8d8639 100644
--- a/shared_swift/LiveKitPlugin.swift
+++ b/shared_swift/LiveKitPlugin.swift
@@ -201,6 +201,7 @@ public class LiveKitPlugin: NSObject, FlutterPlugin {
         }
 
         for processors in audioProcessors.values {
+            processors.visualizers[visualizerId]?.stop()
             processors.visualizers.removeValue(forKey: visualizerId)
         }
 
diff --git a/shared_swift/Visualizer.swift b/shared_swift/Visualizer.swift
index c856ec5ca..aad4c9f44 100644
--- a/shared_swift/Visualizer.swift
+++ b/shared_swift/Visualizer.swift
@@ -69,6 +69,11 @@ public class Visualizer: NSObject, RTCAudioRenderer, FlutterStreamHandler {
         channel?.setStreamHandler(self)
     }
 
+    public func stop() {
+        _track?.remove(audioRenderer: self)
+        channel?.setStreamHandler(nil)
+    }
+
     deinit {
         _track?.remove(audioRenderer: self)
     }

From b6186356d36a633d525463e00769e546282b2f54 Mon Sep 17 00:00:00 2001
From: Hiroshi Horie <548776+hiroshihorie@users.noreply.github.com>
Date: Fri, 27 Feb 2026 03:39:51 +0900
Subject: [PATCH 3/4] changes

---
 .changes/fix-audio-visualizer-missing-plugin-exception | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 .changes/fix-audio-visualizer-missing-plugin-exception

diff --git a/.changes/fix-audio-visualizer-missing-plugin-exception b/.changes/fix-audio-visualizer-missing-plugin-exception
new file mode 100644
index 000000000..d0e10a5c8
--- /dev/null
+++ b/.changes/fix-audio-visualizer-missing-plugin-exception
@@ -0,0 +1 @@
+patch type="fixed" "MissingPluginException when stopping audio visualizer on Android/iOS"

From 1c982828662fd78af397cf3d40c600d26e91c61d Mon Sep 17 00:00:00 2001
From: Hiroshi Horie <548776+hiroshihorie@users.noreply.github.com>
Date: Fri, 27 Feb 2026 03:57:33 +0900
Subject: [PATCH 4/4] nit

---
 shared_swift/Visualizer.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/shared_swift/Visualizer.swift b/shared_swift/Visualizer.swift
index aad4c9f44..19c6bd95d 100644
--- a/shared_swift/Visualizer.swift
+++ b/shared_swift/Visualizer.swift
@@ -75,7 +75,7 @@ public class Visualizer: NSObject, RTCAudioRenderer, FlutterStreamHandler {
     }
 
     deinit {
-        _track?.remove(audioRenderer: self)
+        stop()
     }
 
     public func render(pcmBuffer: AVAudioPCMBuffer) {