fix #5181

Author: jerch

addons/addon-webgl/src/WebglAddon.ts

@@ -88,6 +88,9 @@ export class WebglAddon extends Disposable implements ITerminalAddon , IWebglApi
     renderService.setRenderer(this._renderer);
 
     this._register(toDisposable(() => {
+      if ((this._terminal as any)._core._store._isDisposed) {
+        return;
+      }
       const renderService: IRenderService = (this._terminal as any)._core._renderService;
       renderService.setRenderer((this._terminal as any)._core._createRenderer());
       renderService.handleResize(terminal.cols, terminal.rows);