diff --git a/src/main/menu/actions/edit.js b/src/main/menu/actions/edit.js
index 9bfb30aa..15e2d0f2 100644
--- a/src/main/menu/actions/edit.js
+++ b/src/main/menu/actions/edit.js
@@ -22,7 +22,9 @@ ipcMain.on('mt::ask-for-image-auto-path', (e, { pathname, src, id }) => {
 })
 
 export const edit = (win, type) => {
-  win.webContents.send('AGANI::edit', { type })
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::edit', { type })
+  }
 }
 
 export const screenshot = (win, type) => {
@@ -30,5 +32,7 @@ export const screenshot = (win, type) => {
 }
 
 export const lineEnding = (win, lineEnding) => {
-  win.webContents.send('AGANI::set-line-ending', { lineEnding, ignoreSaveStatus: false })
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::set-line-ending', { lineEnding, ignoreSaveStatus: false })
+  }
 }
diff --git a/src/main/menu/actions/file.js b/src/main/menu/actions/file.js
index 695d49c4..4eba8183 100644
--- a/src/main/menu/actions/file.js
+++ b/src/main/menu/actions/file.js
@@ -420,7 +420,9 @@ ipcMain.on('AGANI::format-link-click', (e, { data, dirname }) => {
 // --- menu -------------------------------------
 
 export const exportFile = (win, type) => {
-  win.webContents.send('mt::show-export-dialog', type)
+  if (win && win.webContents) {
+    win.webContents.send('mt::show-export-dialog', type)
+  }
 }
 
 export const importFile = async win => {
@@ -444,6 +446,9 @@ export const importFile = async win => {
 }
 
 export const print = win => {
+  if (!win) {
+    return
+  }
   // See GH#749, Electron#16085 and Electron#17523.
   dialog.showMessageBox(win, {
     type: 'info',
@@ -492,7 +497,9 @@ export const openFileOrFolder = (win, pathname) => {
 }
 
 export const newBlankTab = win => {
-  win.webContents.send('mt::new-untitled-tab')
+  if (win && win.webContents) {
+    win.webContents.send('mt::new-untitled-tab')
+  }
 }
 
 export const newEditorWindow = () => {
@@ -500,15 +507,21 @@ export const newEditorWindow = () => {
 }
 
 export const closeTab = win => {
-  win.webContents.send('AGANI::close-tab')
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::close-tab')
+  }
 }
 
 export const save = win => {
-  win.webContents.send('AGANI::ask-file-save')
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::ask-file-save')
+  }
 }
 
 export const saveAs = win => {
-  win.webContents.send('AGANI::ask-file-save-as')
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::ask-file-save-as')
+  }
 }
 
 export const autoSave = (menuItem, browserWindow) => {
@@ -517,11 +530,15 @@ export const autoSave = (menuItem, browserWindow) => {
 }
 
 export const moveTo = win => {
-  win.webContents.send('AGANI::ask-file-move-to')
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::ask-file-move-to')
+  }
 }
 
 export const rename = win => {
-  win.webContents.send('AGANI::ask-file-rename')
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::ask-file-rename')
+  }
 }
 
 export const clearRecentlyUsed = () => {
diff --git a/src/main/menu/actions/format.js b/src/main/menu/actions/format.js
index c3948853..8eb53e13 100644
--- a/src/main/menu/actions/format.js
+++ b/src/main/menu/actions/format.js
@@ -9,12 +9,9 @@ const MENU_ID_FORMAT_MAP = {
 }
 
 export const format = (win, type) => {
-  // Fix #961
-  // TODO: This is not the best solution for fix #961, but we don't know how to reproduce this issue.
-  if (!win) {
-    return
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::format', { type })
   }
-  win.webContents.send('AGANI::format', { type })
 }
 
 // --- IPC events -------------------------------------------------------------
diff --git a/src/main/menu/actions/help.js b/src/main/menu/actions/help.js
index 47b83dbc..ec6f6a8f 100644
--- a/src/main/menu/actions/help.js
+++ b/src/main/menu/actions/help.js
@@ -1,7 +1,11 @@
 export const showAboutDialog = win => {
-  win.webContents.send('AGANI::about-dialog')
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::about-dialog')
+  }
 }
 
 export const showTweetDialog = (win, type) => {
-  win.webContents.send('AGANI::tweet', type)
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::tweet', type)
+  }
 }
diff --git a/src/main/menu/actions/paragraph.js b/src/main/menu/actions/paragraph.js
index 1968ad26..df51537e 100644
--- a/src/main/menu/actions/paragraph.js
+++ b/src/main/menu/actions/paragraph.js
@@ -27,7 +27,9 @@ const MENU_ID_MAP = {
 }
 
 export const paragraph = (win, type) => {
-  win.webContents.send('AGANI::paragraph', { type })
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::paragraph', { type })
+  }
 }
 
 // --- IPC events -------------------------------------------------------------
diff --git a/src/main/menu/actions/view.js b/src/main/menu/actions/view.js
index 294e4930..65353c5e 100644
--- a/src/main/menu/actions/view.js
+++ b/src/main/menu/actions/view.js
@@ -4,6 +4,9 @@ const typewriterModeMenuItemId = 'typewriterModeMenuItem'
 const focusModeMenuItemId = 'focusModeMenuItem'
 
 export const typeMode = (win, type, item) => {
+  if (!win) {
+    return
+  }
   const { checked } = item
   win.webContents.send('AGANI::view', { type, checked })
 
@@ -16,7 +19,9 @@ export const typeMode = (win, type, item) => {
 }
 
 export const layout = (item, win, type) => {
-  win.webContents.send('AGANI::listen-for-view-layout', { [type]: item.checked })
+  if (win && win.webContents) {
+    win.webContents.send('AGANI::listen-for-view-layout', { [type]: item.checked })
+  }
 }
 
 export const showTabBar = win => {