diff --git a/packages/core/src/common/message-rpc/rpc-protocol.ts b/packages/core/src/common/message-rpc/rpc-protocol.ts
index 6dfdbb125dad9..ce96bdaaab781 100644
--- a/packages/core/src/common/message-rpc/rpc-protocol.ts
+++ b/packages/core/src/common/message-rpc/rpc-protocol.ts
@@ -132,15 +132,11 @@ export class RpcProtocol {
         // The last element of the request args might be a cancellation token. As these tokens are not serializable we have to remove it from the
         // args array and the `CANCELLATION_TOKEN_KEY` string instead.
         const cancellationToken: CancellationToken | undefined = args.length && CancellationToken.is(args[args.length - 1]) ? args.pop() : undefined;
-        if (cancellationToken && cancellationToken.isCancellationRequested) {
-            return Promise.reject(this.cancelError());
-        }
 
         if (cancellationToken) {
             args.push(RpcProtocol.CANCELLATION_TOKEN_KEY);
             cancellationToken.onCancellationRequested(() => {
                 this.sendCancel(id);
-                this.pendingRequests.get(id)?.reject(this.cancelError());
             }
             );
         }
@@ -164,12 +160,6 @@ export class RpcProtocol {
         output.commit();
     }
 
-    cancelError(): Error {
-        const error = new Error('"Request has already been canceled by the sender"');
-        error.name = 'Cancel';
-        return error;
-    }
-
     protected handleCancel(id: number): void {
         const cancellationTokenSource = this.cancellationTokenSources.get(id);
         if (cancellationTokenSource) {