fix: avoid logging same error twice when thrown by user in global handler

fix #9445

src/core/util/error.js

@@ -49,9 +49,13 @@ function globalHandleError (err, vm, info) {
     try {
       return config.errorHandler.call(null, err, vm, info)
     } catch (e) {
+      // if the user intentionally throws the original error in the handler,
+      // do not log it twice
+      if (e !== err) {
         logError(e, null, 'config.errorHandler')
       }
     }
+  }
   logError(err, vm, info)
 }