diff --git a/app/src/layout/dock/Files.ts b/app/src/layout/dock/Files.ts
index 5a7b8021c..73422b430 100644
--- a/app/src/layout/dock/Files.ts
+++ b/app/src/layout/dock/Files.ts
@@ -766,7 +766,7 @@ export class Files extends Model {
             return;
         }
         let currentPath = filePath;
-        let liElement
+        let liElement;
         while (!liElement) {
             liElement = treeElement.querySelector(`[data-path="${currentPath}"]`);
             if (!liElement) {
@@ -777,7 +777,7 @@ export class Files extends Model {
                     currentPath = dirname + ".sy";
                 }
             } else {
-                liElement.querySelector(".fn__hidden").classList.remove("fn__hidden");
+                liElement.querySelector(".fn__hidden")?.classList.remove("fn__hidden");
                 break;
             }
         }
diff --git a/app/src/menus/workspace.ts b/app/src/menus/workspace.ts
index b265beb6e..6f3946822 100644
--- a/app/src/menus/workspace.ts
+++ b/app/src/menus/workspace.ts
@@ -549,7 +549,7 @@ const workspaceItem = (item: IWorkspace) => {
             writeText(item.path);
             showMessage(window.siyuan.languages.copied);
         }
-    }]
+    }];
     if (item.path !== window.siyuan.config.system.workspaceDir) {
         submenu.splice(0, 0, {
             id: "openBy",
@@ -558,7 +558,7 @@ const workspaceItem = (item: IWorkspace) => {
             click() {
                 openWorkspace(item.path);
             }
-        })
+        });
         if (item.closed) {
             submenu.push({
                 id: "removeWorkspaceTip",
diff --git a/app/src/mobile/dock/MobileFiles.ts b/app/src/mobile/dock/MobileFiles.ts
index e3999992e..b71f291dc 100644
--- a/app/src/mobile/dock/MobileFiles.ts
+++ b/app/src/mobile/dock/MobileFiles.ts
@@ -279,7 +279,7 @@ export class MobileFiles extends Model {
             return;
         }
         let currentPath = filePath;
-        let liElement
+        let liElement;
         while (!liElement) {
             liElement = treeElement.querySelector(`[data-path="${currentPath}"]`);
             if (!liElement) {
@@ -290,7 +290,7 @@ export class MobileFiles extends Model {
                     currentPath = dirname + ".sy";
                 }
             } else {
-                liElement.querySelector(".fn__hidden").classList.remove("fn__hidden");
+                liElement.querySelector(".fn__hidden")?.classList.remove("fn__hidden");
                 break;
             }
         }
diff --git a/app/src/protyle/wysiwyg/getBlock.ts b/app/src/protyle/wysiwyg/getBlock.ts
index d33ea8a9f..d2c4facd3 100644
--- a/app/src/protyle/wysiwyg/getBlock.ts
+++ b/app/src/protyle/wysiwyg/getBlock.ts
@@ -168,7 +168,7 @@ export const isEndOfBlock = (range: Range) => {
         return  false;
     }
 
-    let nextSibling = range.endContainer
+    let nextSibling = range.endContainer;
     while (nextSibling) {
         if (hasNextSibling(nextSibling)) {
             return false;
@@ -176,12 +176,12 @@ export const isEndOfBlock = (range: Range) => {
             if (nextSibling.parentElement.getAttribute("spellcheck")) {
                 return true;
             }
-            nextSibling = nextSibling.parentElement
+            nextSibling = nextSibling.parentElement;
         }
     }
 
     return true;
-}
+};
 
 export const hasPreviousSibling = (element: Node) => {
     let previousSibling = element.previousSibling;
diff --git a/app/src/protyle/wysiwyg/keydown.ts b/app/src/protyle/wysiwyg/keydown.ts
index 607121791..0278a05fc 100644
--- a/app/src/protyle/wysiwyg/keydown.ts
+++ b/app/src/protyle/wysiwyg/keydown.ts
@@ -342,7 +342,7 @@ export const keydown = (protyle: IProtyle, editorElement: HTMLElement) => {
                     event.stopPropagation();
                     return;
                 }
-                const nodeEditableElement = getContenteditableElement(nodeElement)
+                const nodeEditableElement = getContenteditableElement(nodeElement);
                 const position = getSelectionOffset(nodeEditableElement, protyle.wysiwyg.element, range);
                 if (position.start === 0 && event.key === "ArrowLeft") {
                     event.preventDefault();