diff --git a/ext/src/background/receiverSelector/NativeReceiverSelector.ts b/ext/src/background/receiverSelector/NativeReceiverSelector.ts
index 5dbd617..4733ebc 100644
--- a/ext/src/background/receiverSelector/NativeReceiverSelector.ts
+++ b/ext/src/background/receiverSelector/NativeReceiverSelector.ts
@@ -36,7 +36,7 @@ export default class NativeReceiverSelector extends ReceiverSelector {
             receivers: Receiver[]
           , defaultMediaType: ReceiverSelectorMediaType
           , availableMediaTypes: ReceiverSelectorMediaType
-          , requestedAppId: string): Promise<void> {
+          , requestedAppId?: string): Promise<void> {
 
         this.bridgePort = await bridge.connect();
 
@@ -70,8 +70,9 @@ export default class NativeReceiverSelector extends ReceiverSelector {
               , i18n_extensionName: _("extensionName")
               , i18n_castButtonTitle: _("popupCastButtonTitle")
               , i18n_stopButtonTitle: _("popupStopButtonTitle")
-              , i18n_mediaTypeApp: knownApps[requestedAppId]?.name
-                        ?? _("popupMediaTypeApp")
+              , i18n_mediaTypeApp:
+                        (requestedAppId && knownApps[requestedAppId]?.name)
+                            ?? _("popupMediaTypeApp")
               , i18n_mediaTypeTab: _("popupMediaTypeTab")
               , i18n_mediaTypeScreen: _("popupMediaTypeScreen")
               , i18n_mediaTypeFile: _("popupMediaTypeFile")
diff --git a/ext/src/background/receiverSelector/PopupReceiverSelector.ts b/ext/src/background/receiverSelector/PopupReceiverSelector.ts
index 9a45bf4..ee92192 100644
--- a/ext/src/background/receiverSelector/PopupReceiverSelector.ts
+++ b/ext/src/background/receiverSelector/PopupReceiverSelector.ts
@@ -56,7 +56,7 @@ export default class PopupReceiverSelector extends ReceiverSelector {
             receivers: Receiver[]
           , defaultMediaType: ReceiverSelectorMediaType
           , availableMediaTypes: ReceiverSelectorMediaType
-          , requestedAppId: string): Promise<void> {
+          , requestedAppId?: string): Promise<void> {
 
         this.requestedAppId = requestedAppId;
 
@@ -145,8 +145,7 @@ export default class PopupReceiverSelector extends ReceiverSelector {
             this.messagePortDisconnected = true;
         });
 
-        if (!this.requestedAppId
-         || !this.receivers
+        if (!this.receivers
          || !this.defaultMediaType
          || !this.availableMediaTypes) {
             throw logger.error("Popup receiver data not found.");
diff --git a/ext/src/background/receiverSelector/ReceiverSelector.ts b/ext/src/background/receiverSelector/ReceiverSelector.ts
index 9e8ac38..b02e706 100644
--- a/ext/src/background/receiverSelector/ReceiverSelector.ts
+++ b/ext/src/background/receiverSelector/ReceiverSelector.ts
@@ -45,7 +45,7 @@ export default abstract class ReceiverSelector
     abstract open (receivers: Receiver[]
         , defaultMediaType: ReceiverSelectorMediaType
         , availableMediaTypes: ReceiverSelectorMediaType
-        , requestedAppId: string): void;
+        , requestedAppId?: string): void;
 
     abstract close (): void;
 }
diff --git a/ext/src/background/receiverSelector/ReceiverSelectorManager.ts b/ext/src/background/receiverSelector/ReceiverSelectorManager.ts
index e10cd20..f7201e1 100644
--- a/ext/src/background/receiverSelector/ReceiverSelectorManager.ts
+++ b/ext/src/background/receiverSelector/ReceiverSelectorManager.ts
@@ -204,7 +204,7 @@ async function getSelection (
                 Array.from(StatusManager.getReceivers())
               , defaultMediaType
               , availableMediaTypes
-              , currentShim?.requestedAppId ?? DEFAULT_MEDIA_RECEIVER_APP_ID);
+              , currentShim?.requestedAppId);
     });
 }
 
diff --git a/ext/src/lib/messaging.ts b/ext/src/lib/messaging.ts
index db464ed..f49d321 100644
--- a/ext/src/lib/messaging.ts
+++ b/ext/src/lib/messaging.ts
@@ -18,7 +18,7 @@ export type Messages = [
     {
         subject: "popup:/sendRequestedAppId"
       , data: {
-            requestedAppId: string;
+            requestedAppId?: string;
         }
     }
   , {
diff --git a/ext/src/ui/popup/index.tsx b/ext/src/ui/popup/index.tsx
index 6158af1..8d83d98 100755
--- a/ext/src/ui/popup/index.tsx
+++ b/ext/src/ui/popup/index.tsx
@@ -78,10 +78,9 @@ class PopupApp extends Component<{}, PopupAppState> {
                 }
 
                 case "popup:/populateReceiverList": {
-                    const { receivers, availableMediaTypes, defaultMediaType }
-                        : { receivers: Receiver[]
-                          , availableMediaTypes: ReceiverSelectorMediaType
-                          , defaultMediaType: ReceiverSelectorMediaType } = message.data;
+                    const { receivers
+                          , availableMediaTypes
+                          , defaultMediaType } = message.data;
 
                     this.defaultMediaType = defaultMediaType;