diff --git a/vscode-lean4/src/infoview.ts b/vscode-lean4/src/infoview.ts
index 38e4dea1..3412ced8 100644
--- a/vscode-lean4/src/infoview.ts
+++ b/vscode-lean4/src/infoview.ts
@@ -481,6 +481,7 @@ export class InfoProvider implements Disposable {
         // active client is changing.
         this.clearNotificationHandlers()
         this.clearRpcSessions(null)
+        this.webviewPanel?.dispose()
         for (const s of this.clientSubscriptions) {
             s.dispose()
         }