diff --git a/src/Terminal/JupyterLabAppFactory.ts b/src/Terminal/JupyterLabAppFactory.ts
index 9a177a8c9..6d85c9e7b 100644
--- a/src/Terminal/JupyterLabAppFactory.ts
+++ b/src/Terminal/JupyterLabAppFactory.ts
@@ -46,7 +46,7 @@ export class JupyterLabAppFactory {
     }
   }
 
-  public async createTerminalApp(serverSettings: ServerConnection.ISettings): Promise<ITerminalConnection> {
+  public async createTerminalApp(serverSettings: ServerConnection.ISettings): Promise<ITerminalConnection | undefined> {
     const manager = new TerminalManager({
       serverSettings: serverSettings,
     });
diff --git a/src/Terminal/index.ts b/src/Terminal/index.ts
index 145b43d2e..0bef5eef5 100644
--- a/src/Terminal/index.ts
+++ b/src/Terminal/index.ts
@@ -73,7 +73,7 @@ const closeTab = (tabId: string): void => {
 };
 
 const main = async (): Promise<void> => {
-  let session: ITerminalConnection;
+  let session: ITerminalConnection | undefined;
   postRobot.on(
     "props",
     {