diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index 51b2375da0..9d7b7c5074 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -494,7 +494,7 @@ export class ApPersonService implements OnModuleInit, OnApplicationShutdown {
 				user = u as MiRemoteUser;
 				publicKey = await this.userPublickeysRepository.findOneBy({ userId: user.id });
 			} else {
-				this.logger.error('Error creating Person:', e instanceof Error ? e : new Error(e as string));
+				this.logger.error(`Error creating Person ${uri}: ${renderInlineError(e)}`);
 				throw e;
 			}
 		}
@@ -777,7 +777,7 @@ export class ApPersonService implements OnModuleInit, OnApplicationShutdown {
 					return result;
 				})
 				.catch(e => {
-					this.logger.info(`Processing Move Failed @${updated.username}@${updated.host} (${uri})`, { stack: e });
+					this.logger.info(`Processing Move Failed @${updated.username}@${updated.host} (${uri}): ${renderInlineError(e)}`);
 				});
 		}
 
diff --git a/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts b/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts
index 3be5b8401b..d35f4ac6d9 100644
--- a/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts
+++ b/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts
@@ -68,9 +68,7 @@ export class ImportCustomEmojisProcessorService {
 			fs.writeFileSync(destPath, '', 'binary');
 			await this.downloadService.downloadUrl(file.url, destPath, { operationTimeout: this.config.import?.downloadTimeout, maxSize: this.config.import?.maxFileSize });
 		} catch (e) { // TODO: 何度か再試行
-			if (e instanceof Error || typeof e === 'string') {
-				this.logger.error('Error importing custom emojis:', e as Error);
-			}
+			this.logger.error(`Error importing custom emojis: ${renderInlineError(e)}`);
 			throw e;
 		}
 
diff --git a/packages/backend/src/server/web/UrlPreviewService.ts b/packages/backend/src/server/web/UrlPreviewService.ts
index 71a142fc6f..438aa5905d 100644
--- a/packages/backend/src/server/web/UrlPreviewService.ts
+++ b/packages/backend/src/server/web/UrlPreviewService.ts
@@ -33,6 +33,7 @@ import { getIpHash } from '@/misc/get-ip-hash.js';
 import { isRetryableError } from '@/misc/is-retryable-error.js';
 import * as Acct from '@/misc/acct.js';
 import { isNote } from '@/core/activitypub/type.js';
+import { renderInlineError } from '@/misc/render-inline-error.js';
 import type { FastifyRequest, FastifyReply } from 'fastify';
 
 export type LocalSummalyResult = SummalyResult & {
@@ -260,7 +261,7 @@ export class UrlPreviewService {
 
 			return reply.code(200).send(summary);
 		} catch (err) {
-			this.logger.warn(`Failed to get preview of ${url} for ${lang}: ${err}`);
+			this.logger.warn(`Failed to get preview of ${url} for ${lang}: ${renderInlineError(err)}`);
 
 			reply.header('Cache-Control', 'max-age=3600');
 			return reply.code(422).send({