diff --git a/src/main.ts b/src/main.ts
index 0a34aa9..a7c9ae8 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -80,13 +80,17 @@ export default class OpenWords extends Plugin {
     // 激活视图
     async activateView() {
         const leaves = this.app.workspace.getLeavesOfType(MAIN_VIEW);
+
         if (leaves.length === 0) {
             await this.app.workspace.getLeaf(true).setViewState({
                 type: MAIN_VIEW,
                 active: true,
             });
         } else {
-            await this.app.workspace.revealLeaf(leaves[0]);
+            const leaf = leaves[0];
+            if (leaf) {
+                await this.app.workspace.revealLeaf(leaf);
+            }
         }
     }
 
@@ -286,7 +290,7 @@ export default class OpenWords extends Plugin {
                     const innerWord = doubleBracketMatch[1]; // 获取双链中的名称
                     const alias = doubleBracketMatch[3]; // 获取双链中的别名
                     // 如果双链中的名称不在单词表中，去除双链，保留别名或名称
-                    if (!unmasteredWords.has(innerWord)) {
+                    if (innerWord && !unmasteredWords.has(innerWord)) {
                         return alias; // 如果有别名，保留别名；否则保留名称
                     }
                     // 如果双链中的名称在单词表中，保持原样
diff --git a/src/views/LearningPage.ts b/src/views/LearningPage.ts
index dfdecd6..ab6f934 100644
--- a/src/views/LearningPage.ts
+++ b/src/views/LearningPage.ts
@@ -69,11 +69,11 @@ export function pickNextLCard(this: MainView) {
     }
     const randomMode = Math.random() < this.plugin.settings.randomRatio;
     if (randomMode) {
-        return pool[Math.floor(Math.random() * pool.length)];
+        return pool[Math.floor(Math.random() * pool.length)] ?? null;
     } else {
         const topN = Math.max(1, Math.ceil(pool.length / 100));
         const topPool = pool.slice(0, topN);
-        return topPool[Math.floor(Math.random() * topPool.length)];
+        return topPool[Math.floor(Math.random() * topPool.length)] ?? null;
     }
 }
 
@@ -105,7 +105,7 @@ export function renderCard(this: MainView, cardContainer: HTMLDivElement) {
 }
 
 // 评分按钮渲染
-export function renderSettings(cardContainer: HTMLDivElement, settingsContainer: HTMLElement) {
+export function renderSettings(this: MainView, cardContainer: HTMLDivElement, settingsContainer: HTMLElement) {
     const grades: { grade: SuperMemoGrade, label: string }[] = [
         { grade: 0, label: '评分 1: 回答错误, 完全不会' },
         { grade: 1, label: '评分 2: 回答错误, 看到正确答案后感觉很熟悉' },
diff --git a/src/views/MainView.ts b/src/views/MainView.ts
index 1fc8aa0..4050e11 100644
--- a/src/views/MainView.ts
+++ b/src/views/MainView.ts
@@ -51,7 +51,7 @@ export class MainView extends ItemView {
 
     async onOpen() {
         this.component.load();
-        const container = this.containerEl.children[1];
+        const container = this.containerEl.querySelector('.view-content') as HTMLElement;
         this.viewContainer = container.createDiv({ cls: 'openwords-view-container' });
         this.statusBarEl = container.createDiv({ cls: 'openwords-view-statusbar' });
         await this.render();
diff --git a/src/views/SpellingPage.ts b/src/views/SpellingPage.ts
index 3e96309..fdfb42b 100644
--- a/src/views/SpellingPage.ts
+++ b/src/views/SpellingPage.ts
@@ -59,7 +59,7 @@ export function pickNextSCard(this: MainView) {
     const sorted = cards.slice().sort((a, b) => a.efactor - b.efactor);
     const half = Math.ceil(sorted.length / 2);
     const pool = sorted.slice(0, half);
-    return pool[Math.floor(Math.random() * pool.length)];
+    return pool[Math.floor(Math.random() * pool.length)] ?? null;
 }
 
 export async function renderInput(
@@ -106,19 +106,19 @@ export async function renderInput(
 
             inputField.addEventListener('input', () => {
                 if (inputField.value.length === 1 && i < word.length - 1) {
-                    inputFields[i + 1].focus();
+                    inputFields[i + 1]?.focus();
                 }
                 this.checkSpelling(inputFields, word, feedbackContainer, wordMeaningContainer, inputContainer);
             });
 
             inputField.addEventListener('keydown', (event) => {
                 if (event.key === 'Backspace' && inputField.value === '' && i > 0) {
-                    inputFields[i - 1].focus();
+                    inputFields[i - 1]?.focus();
                 }
             });
         }
 
-        inputFields[0].focus();
+        inputFields[0]?.focus();
     }
 }
 
@@ -176,7 +176,7 @@ export async function checkSpelling(
             feedbackContainer.setText('错误，请重试！');
             this.errorCount += 1;
             inputFields.forEach((field) => (field.value = ''));
-            inputFields[0].focus();
+            inputFields[0]?.focus();
         }
     }
 }