diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 5951d2d6fa..b2c8fd2bd3 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -288,7 +288,6 @@ export class NoteCreateService implements OnApplicationShutdown {
 				}
 			}
 
-			console.log('matched', matchedString);
 			if (DiscordWebhookUrlWordBlock) {
 				const data_disc = { 'username': 'ノートブロックお知らせ',
 																								'content':
@@ -386,7 +385,40 @@ export class NoteCreateService implements OnApplicationShutdown {
 		let tags = data.apHashtags;
 		let emojis = data.apEmojis;
 		let mentionedUsers = data.apMentions;
+		let tmp:string | null = null;
 
+		if (mentionedUsers !== null && mentionedUsers !== undefined && mentionedUsers.length > 0) {
+			await Promise.all(mentionedUsers.map(async (u) => {
+				if (data.text != null) {
+					const regex = new RegExp(`@${u.username}@${u.host ?? this.config.host}`, 'g');
+					tmp = data.text.replace(regex, '');
+				}
+			}));
+			if ( tmp !== null && tmp.trim() === '') {
+				const { DiscordWebhookUrlWordBlock } = (await this.metaService.fetch());
+				if (DiscordWebhookUrlWordBlock) {
+					await fetch(DiscordWebhookUrlWordBlock, {
+						'method': 'post',
+						headers: {
+							'Content-Type': 'application/json',
+						},
+						body: JSON.stringify({ 'username': 'ノートブロックお知らせ',
+																													'content':
+								'ユーザー名 :' + user.username + '\n' +
+								'url : ' + user.host + '\n' +
+								'contents : ' + data.text + '\n' +
+								'引っかかった原因 メンションしかない',
+
+																													'allowed_mentions': {
+																														'parse': [],
+																													},
+						}),
+					});
+				}
+				console.log('メンションしかない');
+				throw new NoteCreateService.ContainsProhibitedWordsError();
+			}
+		}
 		// Parse MFM if needed
 		if (!tags || !emojis || !mentionedUsers) {
 			const tokens = (data.text ? mfm.parse(data.text)! : []);