1 files changed, 4 insertions, 3 deletions

diff --git a/packages/main/src/index.ts b/packages/main/src/index.ts
index 4a51518..b134002 100644
--- a/packages/main/src/index.ts
+++ b/packages/main/src/index.ts
@@ -219,8 +219,8 @@ function createWindow(): Promise<unknown> {
     webContents.send(MainToRendererIpcMessage.SharedStorePatch, patch);
   });
 
-  ipcMain.on(ServiceToMainIpcMessage.ApiExposedInMainWorld, (event) => {
-    event.returnValue = event.sender.id == browserView.webContents.id
+  ipcMain.handle(ServiceToMainIpcMessage.ApiExposedInMainWorld, (event) => {
+    return event.sender.id == browserView.webContents.id
       ? serviceInject
       : null;
   });
@@ -229,7 +229,8 @@ function createWindow(): Promise<unknown> {
     try {
       switch (channel) {
         case ServiceToMainIpcMessage.ApiExposedInMainWorld:
-          // Synchronous message must be handled with `ipcMain.on`
+          // Asynchronous message with reply must be handled in `ipcMain.handle`,
+          // otherwise electron emits a no handler registered warning.
           break;
         case ServiceToMainIpcMessage.SetUnreadCount:
           console.log('Unread count:', unreadCount.parse(args[0]));