diff --git a/packages/backend/src/server/api/call.ts b/packages/backend/src/server/api/call.ts
index 5bc7d2f25..ea9ab3ccb 100644
--- a/packages/backend/src/server/api/call.ts
+++ b/packages/backend/src/server/api/call.ts
@@ -90,7 +90,7 @@ export default async (endpoint: string, user: User | null | undefined, token: Ac
 
 	// API invoking
 	const before = performance.now();
-	return await ep.exec(data, user, token, ctx!.file).catch((e: Error) => {
+	return await ep.exec(data, user, token, ctx?.file).catch((e: Error) => {
 		if (e instanceof ApiError) {
 			throw e;
 		} else {