diff --git a/packages/backend/src/queue/QueueProcessorService.ts b/packages/backend/src/queue/QueueProcessorService.ts
index e05fe20458..32e8146f55 100644
--- a/packages/backend/src/queue/QueueProcessorService.ts
+++ b/packages/backend/src/queue/QueueProcessorService.ts
@@ -68,6 +68,25 @@ function getJobInfo(job: Bull.Job | undefined, increment = false): string {
 	return `id=${job.id} attempts=${currentAttempts}/${maxAttempts} age=${formated}`;
 }
 
+function renderError(e: Error): any {
+	if (e) { // 何故かeがundefinedで来ることがある
+		return {
+			...Object.getOwnPropertyNames(e).reduce((acc, key) => {
+				//@ts-expect-error Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Error'.
+				acc[key] = e[key];
+				return acc;
+			}, {} as Record<string, any>),
+			stack: e.stack?.split('\n').map(s => s.trim()),
+		};
+	} else {
+		return {
+			stack: '?',
+			message: '?',
+			name: '?',
+		};
+	}
+}
+
 @Injectable()
 export class QueueProcessorService implements OnApplicationShutdown {
 	private logger: Logger;
@@ -118,18 +137,6 @@ export class QueueProcessorService implements OnApplicationShutdown {
 	) {
 		this.logger = this.queueLoggerService.logger;
 
-		function renderError(e: Error): any {
-			if (e) { // 何故かeがundefinedで来ることがある
-				return e;
-			} else {
-				return {
-					stack: '?',
-					message: '?',
-					name: '?',
-				};
-			}
-		}
-
 		//#region system
 		this.systemQueueWorker = new Bull.Worker(QUEUE.SYSTEM, (job) => {
 			switch (job.name) {