Prevent crash after deleting sprite that had been highlighted

src/containers/target-highlight.jsx

@@ -32,7 +32,8 @@ class TargetHighlight extends React.Component {
             vm
         } = this.props;
 
-        if (!(highlightedTargetId && vm && vm.renderer)) return null;
+        if (!(highlightedTargetId && vm && vm.renderer &&
+            vm.runtime.getTargetById(highlightedTargetId))) return null;
 
         const target = vm.runtime.getTargetById(highlightedTargetId);
         const bounds = vm.renderer.getBounds(target.drawableID);

test/integration/stage-size.test.js

+import path from 'path';
+import SeleniumHelper from '../helpers/selenium-helper';
+
+const {
+    clickText,
+    clickXpath,
+    rightClickText,
+    getDriver,
+    getLogs,
+    loadUri,
+    scope
+} = new SeleniumHelper();
+
+const uri = path.resolve(__dirname, '../../build/index.html');
+
+let driver;
+
+describe('Loading scratch gui', () => {
+    beforeAll(() => {
+        driver = getDriver();
+    });
+
+    afterAll(async () => {
+        await driver.quit();
+    });
+
+    test('Switching small/large stage after highlighting and deleting sprite', async () => {
+        await loadUri(uri);
+        await clickXpath('//button[@title="Try It"]');
+
+        // Highlight the sprite
+        await clickText('Sprite1', scope.spriteTile);
+
+        // Delete it
+        await rightClickText('Sprite1', scope.spriteTile);
+        await clickText('delete', scope.spriteTile);
+
+        // Go to small stage mode
+        await clickXpath('//img[@alt="Switch to small stage"]');
+
+        // Confirm app still working
+        await clickXpath('//img[@alt="Switch to large stage"]');
+
+        const logs = await getLogs();
+        await expect(logs).toEqual([]);
+    });
+});