diff --git a/Examples/macOS/PlaybackViewController.swift b/Examples/macOS/PlaybackViewController.swift
index 7c420e845..2dff3a928 100644
--- a/Examples/macOS/PlaybackViewController.swift
+++ b/Examples/macOS/PlaybackViewController.swift
@@ -16,6 +16,12 @@ final class PlaybackViewController: NSViewController {
     }
 
     @IBAction private func didTappedPlayback(_ button: NSButton) {
-        netStreamSwitcher.open(.playback)
+        if button.title == "Playback" {
+            button.title = "Close"
+            netStreamSwitcher.open(.playback)
+        } else {
+            button.title = "Playback"
+            netStreamSwitcher.close()
+        }
     }
 }
diff --git a/Sources/IO/IOTellyUnit.swift b/Sources/IO/IOTellyUnit.swift
index 56bcedb5d..ec90672f4 100644
--- a/Sources/IO/IOTellyUnit.swift
+++ b/Sources/IO/IOTellyUnit.swift
@@ -54,9 +54,10 @@ extension IOTellyUnit: Running {
         guard isRunning.value else {
             return
         }
+        // https://github.com/shogo4405/HaishinKit.swift/issues/1454 
+        mediaLink.stopRunning()
         audioFormat = nil
         videoFormat = nil
-        mediaLink.stopRunning()
         isRunning.mutate { $0 = false }
     }
 }