diff --git a/src/comments/FlashComment.ts b/src/comments/FlashComment.ts
index a66ddf7a..2496aaae 100755
--- a/src/comments/FlashComment.ts
+++ b/src/comments/FlashComment.ts
@@ -36,7 +36,7 @@ class FlashComment extends BaseComment {
   override buttonImage: IRenderer;
   constructor(comment: FormattedComment, renderer: IRenderer, index: number) {
     super(comment, renderer, index);
-    this._globalScale ??= getConfig(config.commentScale, true);
+    this._globalScale = getConfig(config.commentScale, true);
     this.buttonImage = renderer.getCanvas();
   }
 
diff --git a/src/comments/HTML5Comment.ts b/src/comments/HTML5Comment.ts
index e25c0858..46fbaabf 100755
--- a/src/comments/HTML5Comment.ts
+++ b/src/comments/HTML5Comment.ts
@@ -148,7 +148,7 @@ class HTML5Comment extends BaseComment {
 
     for (let i = 0, n = comment.content.length; i < n; i++) {
       const item = comment.content[i];
-      if (item?.type !== "text" || !itemWidth) continue;
+      if (item?.type !== "text" || !itemWidth[i]) continue;
       item.width = itemWidth[i];
     }
     comment.fontSize = (comment.charSize ?? 0) * 0.8;
@@ -247,7 +247,7 @@ class HTML5Comment extends BaseComment {
           (this.comment.lineHeight * (i + 1) +
             (this.comment.charSize - this.comment.lineHeight) / 2 +
             this.comment.lineHeight * -0.16 +
-            (config.fonts.html5[this.comment.font]?.offset || 0)) *
+            (config.fonts.html5[this.comment.font].offset || 0)) *
           scale;
         this.renderer.setStrokeStyle("rgba(255,255,0,0.5)");
         this.renderer.strokeRect(
@@ -287,9 +287,9 @@ class HTML5Comment extends BaseComment {
     const offsetY =
       (this.comment.charSize - this.comment.lineHeight) / 2 +
       this.comment.lineHeight * -0.16 +
-      (config.fonts.html5[this.comment.font]?.offset || 0);
+      (config.fonts.html5[this.comment.font].offset || 0);
     for (const item of this.comment.content) {
-      if (item?.type === "spacer") {
+      if (item.type === "spacer") {
         lineCount += item.count * item.charWidth * this.comment.fontSize;
         continue;
       }
diff --git a/src/utils/array.ts b/src/utils/array.ts
index c2ab7ebe..b6d68520 100755
--- a/src/utils/array.ts
+++ b/src/utils/array.ts
@@ -11,9 +11,6 @@ const arrayPush = (
   key: string | number,
   push: IComment,
 ) => {
-  if (!array) {
-    array = {};
-  }
   if (!array[Number(key)]) {
     array[Number(key)] = [];
   }
diff --git a/src/utils/comment.ts b/src/utils/comment.ts
index 912cf296..50df6c05 100755
--- a/src/utils/comment.ts
+++ b/src/utils/comment.ts
@@ -87,7 +87,7 @@ const nicoscriptReplaceIgnoreable = (
   (item.condition === "\u5b8c\u5168\u4e00\u81f4" &&
     comment.content !== item.keyword) ||
   (item.condition === "\u90e8\u5206\u4e00\u81f4" &&
-    comment.content.indexOf(item.keyword) === -1);
+    !comment.content.includes(item.keyword));
 
 /**
  * 置換コマンドを適用する
@@ -408,9 +408,9 @@ const processAtButton = (
     groups: { before?: string; body?: string; after?: string };
   };
   const message = {
-    before: content.groups?.before ?? "",
-    body: content.groups?.body ?? "",
-    after: content.groups?.after ?? "",
+    before: content.groups.before ?? "",
+    body: content.groups.body ?? "",
+    after: content.groups.after ?? "",
   };
   commands.button = {
     message,
diff --git a/src/utils/commentArt.ts b/src/utils/commentArt.ts
index 5d42696d..0b234904 100755
--- a/src/utils/commentArt.ts
+++ b/src/utils/commentArt.ts
@@ -48,7 +48,7 @@ const getUsersScore = (
 ): { [key: string]: number } => {
   const userScoreList: { [key: number]: number } = {};
   for (const comment of comments) {
-    if (comment.user_id === undefined || comment.user_id === -1) continue;
+    if (comment.user_id === -1) continue;
     userScoreList[comment.user_id] ||= 0;
     if (
       comment.mail.includes("ca") ||