diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index f516ccbad8..3c1aed63e8 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -540,7 +540,7 @@ function onCompositionEnd(ev: CompositionEvent) {
 }
 
 async function onPaste(ev: ClipboardEvent) {
-	for (const { item, i } of Array.from(ev.clipboardData.items).map((item, i) => ({ item, i }))) {
+	for (const { item, i } of Array.from(ev.clipboardData.items, (item, i) => ({ item, i }))) {
 		if (item.kind === 'file') {
 			const file = item.getAsFile();
 			const lio = file.name.lastIndexOf('.');
diff --git a/packages/frontend/src/components/MkTagCloud.vue b/packages/frontend/src/components/MkTagCloud.vue
index 6e4e054aad..3635dc360e 100644
--- a/packages/frontend/src/components/MkTagCloud.vue
+++ b/packages/frontend/src/components/MkTagCloud.vue
@@ -16,8 +16,8 @@ import tinycolor from 'tinycolor2';
 const loaded = !!window.TagCanvas;
 const SAFE_FOR_HTML_ID = 'abcdefghijklmnopqrstuvwxyz';
 const computedStyle = getComputedStyle(document.documentElement);
-const idForCanvas = Array.from(Array(16)).map(() => SAFE_FOR_HTML_ID[Math.floor(Math.random() * SAFE_FOR_HTML_ID.length)]).join('');
-const idForTags = Array.from(Array(16)).map(() => SAFE_FOR_HTML_ID[Math.floor(Math.random() * SAFE_FOR_HTML_ID.length)]).join('');
+const idForCanvas = Array.from(Array(16), () => SAFE_FOR_HTML_ID[Math.floor(Math.random() * SAFE_FOR_HTML_ID.length)]).join('');
+const idForTags = Array.from(Array(16), () => SAFE_FOR_HTML_ID[Math.floor(Math.random() * SAFE_FOR_HTML_ID.length)]).join('');
 let available = $ref(false);
 let rootEl = $shallowRef<HTMLElement | null>(null);
 let canvasEl = $shallowRef<HTMLCanvasElement | null>(null);
diff --git a/packages/frontend/src/scripts/emoji-base.ts b/packages/frontend/src/scripts/emoji-base.ts
index 3f05642d57..e91f2fa22d 100644
--- a/packages/frontend/src/scripts/emoji-base.ts
+++ b/packages/frontend/src/scripts/emoji-base.ts
@@ -2,7 +2,7 @@ const twemojiSvgBase = '/twemoji';
 const fluentEmojiPngBase = '/fluent-emoji';
 
 export function char2twemojiFilePath(char: string): string {
-	let codes = Array.from(char).map(x => x.codePointAt(0)?.toString(16));
+	let codes = Array.from(char, x => x.codePointAt(0)?.toString(16));
 	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
 	codes = codes.filter(x => x && x.length);
 	const fileName = codes.join('-');
@@ -10,7 +10,7 @@ export function char2twemojiFilePath(char: string): string {
 }
 
 export function char2fluentEmojiFilePath(char: string): string {
-	let codes = Array.from(char).map(x => x.codePointAt(0)?.toString(16));
+	let codes = Array.from(char, x => x.codePointAt(0)?.toString(16));
 	// Fluent Emojiは国旗非対応 https://github.com/microsoft/fluentui-emoji/issues/25
 	if (codes[0]?.startsWith('1f1')) return char2twemojiFilePath(char);
 	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
diff --git a/packages/frontend/src/scripts/select-file.ts b/packages/frontend/src/scripts/select-file.ts
index 44a58d6c7d..891da6eb78 100644
--- a/packages/frontend/src/scripts/select-file.ts
+++ b/packages/frontend/src/scripts/select-file.ts
@@ -12,7 +12,8 @@ export function chooseFileFromPc(multiple: boolean, keepOriginal = false): Promi
 		input.type = 'file';
 		input.multiple = multiple;
 		input.onchange = () => {
-			const promises = Array.from(input.files).map(file => uploadFile(file, defaultStore.state.uploadFolder, undefined, keepOriginal));
+			if (!input.files) return res([]);
+			const promises = Array.from(input.files, file => uploadFile(file, defaultStore.state.uploadFolder, undefined, keepOriginal));
 
 			Promise.all(promises).then(driveFiles => {
 				res(driveFiles);