diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d53e4c1fad2..03dd1407bcb6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@
   - 自動でバックアップされるように
 
 ### Server
--
+- Fix: プロフィール追加情報で無効なURLに入力された場合に照会エラーを出るのを修正
 
 
 ## 2025.3.1
diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 83a095cdea17..f01874952fae 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -499,11 +499,28 @@ export class ApRendererService {
 			this.userProfilesRepository.findOneByOrFail({ userId: user.id }),
 		]);
 
+		const tryRewriteUrl = (maybeUrl: string) => {
+			const urlSafeRegex = /^(?:http[s]?:\/\/.)?(?:www\.)?[-a-zA-Z0-9@%._\+~#=]{2,256}\.[a-z]{2,6}\b(?:[-a-zA-Z0-9@:%_\+.~#?&\/\/=]*)/;
+			try {
+				const match = maybeUrl.match(urlSafeRegex);
+				if (!match) {
+					return maybeUrl;
+				}
+				const urlPart = match[0];
+				const urlPartParsed = new URL(urlPart);
+				const restPart = maybeUrl.slice(match[0].length);
+				
+				return `<a href="${urlPartParsed.href}" rel="me nofollow noopener" target="_blank">${urlPart}</a>${restPart}`;
+			} catch (e) {
+				return maybeUrl;
+			}
+		};
+
 		const attachment = profile.fields.map(field => ({
 			type: 'PropertyValue',
 			name: field.name,
 			value: (field.value.startsWith('http://') || field.value.startsWith('https://'))
-				? `<a href="${new URL(field.value).href}" rel="me nofollow noopener" target="_blank">${new URL(field.value).href}</a>`
+				? tryRewriteUrl(field.value)
 				: field.value,
 		}));