diff --git a/packages/backend/src/queue/processors/inbox.ts b/packages/backend/src/queue/processors/inbox.ts
index d9e1fdee5..5e80af8aa 100644
--- a/packages/backend/src/queue/processors/inbox.ts
+++ b/packages/backend/src/queue/processors/inbox.ts
@@ -41,13 +41,15 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 				return `skip: unsupported LD-signature type ${activity.signature.type}`;
 			}
 
-			// get user based on LD-Signature key id.
-			// lets assume that the creator has this common form:
-			// <https://example.com/users/user#main-key>
-			// Then we can use it as the key id and (without fragment part) user id.
-			authUser = await getAuthUser(activity.signature.creator, activity.signature.creator.replace(/#.*$/, ''), resolver);
+			try {
+				// get user based on LD-Signature key id.
+				// lets assume that the creator has this common form:
+				// <https://example.com/users/user#main-key>
+				// Then we can use it as the key id and (without fragment part) user id.
+				authUser = await getAuthUser(activity.signature.creator, activity.signature.creator.replace(/#.*$/, ''), resolver);
 
-			if (authUser == null) {
+				if (authUser == null) throw new Error();
+			} catch {
 				return 'skip: failed to resolve LD-Signature user';
 			}