diff --git a/app/src/main/java/org/houxg/leamonax/ui/NotePreviewActivity.java b/app/src/main/java/org/houxg/leamonax/ui/NotePreviewActivity.java
index 180fc61..6417968 100644
--- a/app/src/main/java/org/houxg/leamonax/ui/NotePreviewActivity.java
+++ b/app/src/main/java/org/houxg/leamonax/ui/NotePreviewActivity.java
@@ -11,6 +11,8 @@ import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 
+import com.tencent.bugly.crashreport.CrashReport;
+
 import org.houxg.leamonax.BuildConfig;
 import org.houxg.leamonax.R;
 import org.houxg.leamonax.database.AppDataBase;
@@ -48,8 +50,6 @@ public class NotePreviewActivity extends BaseActivity implements EditorFragment.
     @BindView(R.id.tv_revert)
     View mRevertBtn;
 
-    private ProgressDialog mProgressDialog;
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -58,7 +58,12 @@ public class NotePreviewActivity extends BaseActivity implements EditorFragment.
         initToolBar((Toolbar) findViewById(R.id.toolbar), true);
         long noteLocalId = getIntent().getLongExtra(EXT_NOTE_LOCAL_ID, -1);
         mNote = AppDataBase.getNoteByLocalId(noteLocalId);
-
+        if (mNote == null) {
+            ToastUtils.show(this, R.string.note_not_found);
+            CrashReport.postCatchedException(new IllegalStateException("Note not found while preview, localId=" + noteLocalId));
+            finish();
+            return;
+        }
         mEditorFragment = EditorFragment.getNewInstance(mNote.isMarkDown(), false);
         getSupportFragmentManager().beginTransaction().add(R.id.container, mEditorFragment).commit();
     }
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 48803f7..77da284 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -75,4 +75,5 @@
     <string name="about">关于</string>
     <string name="feedback">反馈</string>
     <string name="sign_up">注册</string>
+    <string name="note_not_found">找不到该笔记，请重试</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 554ea1e..0774d13 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -31,7 +31,7 @@
     <string name="delete_note_failed">Delete note failed</string>
     <string name="email_or_password_incorrect">Email or password is incorrect</string>
     <string name="network_error">Network error</string>
-    <string name="untitled" translatable="false">Untitled</string>
+    <string name="untitled">Untitled</string>
     <string name="time_yesterday">Yesterday %s</string>
     <string name="use_leanote_host">Use Leanote.com</string>
     <string name="use_custom_host">Use custom host</string>
@@ -74,4 +74,5 @@
     <string name="select_notebook">Select notebook</string>
     <string name="feedback">Feedback</string>
     <string name="sign_up">Sign up</string>
+    <string name="note_not_found">Note not found, please try again</string>
 </resources>