diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index 78afe9af2..8ddecd15f 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -1379,6 +1379,8 @@ for (const snippet of [
   'injectLifecycleEvent',
   'injectNetworkStatusEvent',
   'logMobileHostEventFailure',
+  'try {',
+  'logMobileHostEventFailure(event, error)',
   "logMobileHostEventFailure('network.statusChanged', error)",
   'handleWebViewLoad',
   'onLoad={handleWebViewLoad}',
@@ -2435,6 +2437,9 @@ for (const snippet of [
   "lastHostBridgeEvent('navigation.canGoBack')",
   "shellHarness.appStateListeners[0]?.('background')",
   'shellHarness.networkListeners[0]?.({',
+  'injectJavaScriptError',
+  "test('host event injection failures are logged without crashing the shell'",
+  "new Error('webview injection failed')",
   "type: 'genarrative.mobile.historyState'",
   'mobile host event failed for network.statusChanged',
   'external WebView navigation native failures stay outside the WebView',
diff --git a/apps/mobile-shell/src/shell/ShellApp.test.tsx b/apps/mobile-shell/src/shell/ShellApp.test.tsx
index 158157122..443da57da 100644
--- a/apps/mobile-shell/src/shell/ShellApp.test.tsx
+++ b/apps/mobile-shell/src/shell/ShellApp.test.tsx
@@ -15,18 +15,21 @@ const shellHarness = vi.hoisted(() => {
   const appStateListeners = [] as Array<(state: string) => void>;
   const webViewProps = { current: null as Record<string, unknown> | null };
   const cameraViewProps = { current: null as Record<string, unknown> | null };
+  const injectJavaScriptError = { current: null as Error | null };
   const injectedScripts = [] as string[];
   const networkListeners = [] as Array<(state: Record<string, unknown>) => void>;
 
   return {
     appStateListeners,
     cameraViewProps,
+    injectJavaScriptError,
     injectedScripts,
     networkListeners,
     reset() {
       appStateListeners.length = 0;
       webViewProps.current = null;
       cameraViewProps.current = null;
+      injectJavaScriptError.current = null;
       injectedScripts.length = 0;
       networkListeners.length = 0;
     },
@@ -158,6 +161,9 @@ vi.mock('react-native-webview', () => ({
     React.useImperativeHandle(ref, () => ({
       goBack: vi.fn(),
       injectJavaScript: (script: string) => {
+        if (shellHarness.injectJavaScriptError.current) {
+          throw shellHarness.injectJavaScriptError.current;
+        }
         shellHarness.injectedScripts.push(script);
       },
       reload: vi.fn(),
@@ -372,6 +378,34 @@ describe('ShellApp HostBridge event injection', () => {
     });
   });
 
+  test('host event injection failures are logged without crashing the shell', async () => {
+    const ShellApp = await importShellApp();
+    render(<ShellApp />);
+
+    await waitFor(() => {
+      expect(shellHarness.networkListeners.length).toBeGreaterThan(0);
+    });
+
+    const injectionError = new Error('webview injection failed');
+    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => undefined);
+    shellHarness.injectJavaScriptError.current = injectionError;
+
+    expect(() => {
+      shellHarness.networkListeners[0]?.({
+        isConnected: false,
+        isInternetReachable: false,
+        type: 'NONE',
+      });
+    }).not.toThrow();
+
+    expect(warnSpy).toHaveBeenCalledWith(
+      'mobile host event failed for network.statusChanged',
+      injectionError,
+    );
+
+    warnSpy.mockRestore();
+  });
+
   test('native and H5 navigation state inject combined navigation.canGoBack events', async () => {
     const ShellApp = await importShellApp();
     render(<ShellApp />);
diff --git a/apps/mobile-shell/src/shell/ShellApp.tsx b/apps/mobile-shell/src/shell/ShellApp.tsx
index 950d17095..7f6e4174c 100644
--- a/apps/mobile-shell/src/shell/ShellApp.tsx
+++ b/apps/mobile-shell/src/shell/ShellApp.tsx
@@ -124,9 +124,13 @@ export default function ShellApp() {
   }, []);
   const injectHostBridgeEvent = useCallback(
     (event: HostBridgeEventName, payload: unknown) => {
-      webViewRef.current?.injectJavaScript(
-        buildHostBridgeEventScript(event, payload),
-      );
+      try {
+        webViewRef.current?.injectJavaScript(
+          buildHostBridgeEventScript(event, payload),
+        );
+      } catch (error) {
+        logMobileHostEventFailure(event, error);
+      }
     },
     [],
   );
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index f9cbbfc73..3ef6d337f 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -16,6 +16,14 @@
 
 ---
 
+## 2026-06-20 移动 HostBridge 事件注入失败边界
+
+- 背景：Expo 移动壳通过 WebView `injectJavaScript` 把 `app.lifecycle`、`network.statusChanged`、`navigation.canGoBack` 等宿主事件回放给 H5；如果 WebView 进程切换、页面卸载或注入同步失败，壳层不能因为宿主事件回放异常而崩溃。
+- 决策：移动壳所有 HostBridge 事件注入必须统一经过 `injectHostBridgeEvent`，该函数捕获同步注入异常并用 `logMobileHostEventFailure(event, error)` 记录；配置检查反查运行时 try/catch 和 ShellApp 注入失败测试。
+- 影响范围：`apps/mobile-shell/src/shell/ShellApp.tsx`、`apps/mobile-shell/src/shell/ShellApp.test.tsx`、`apps/mobile-shell/scripts/check-config.mjs`。
+- 验证方式：`npm run mobile-shell:test -- src/shell/ShellApp.test.tsx`、`npm run mobile-shell:typecheck`、`npm run check:native-shells`、`npm run check:encoding`、`git diff --check`。
+- 关联文档：`docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md`、`docs/【前端架构】宿主壳能力统一协议-2026-06-17.md`。
+
 ## 2026-06-20 桌面图片拖拽坐标非负边界
 
 - 背景：Tauri 桌面壳通过系统拖拽事件向 H5 发送 `file.imageDropped`，拖拽坐标来自窗口事件；窗口边缘或平台差异可能产生负数或小数坐标，H5 只负责校验有限 number，不负责裁剪桌面系统坐标。