diff --git a/lib/activitypub/actor.ts b/lib/activitypub/actor.ts
index 8f69787..61ce816 100644
--- a/lib/activitypub/actor.ts
+++ b/lib/activitypub/actor.ts
@@ -2,9 +2,13 @@ import express, { Router } from "express";
 import { promises as fs } from "fs";
 
 const domain = process.env.DOMAIN;
+const pubKeyPemPath = process.env.PUB_KEY_PEM;
 
 export default async function actor(router: Router) {
-	const pubKeyPem = (await fs.readFile(process.env.PUB_KEY_PEM!)).toString();
+	if (!pubKeyPemPath) {
+		return;
+	}
+	const pubKeyPem = (await fs.readFile(pubKeyPemPath)).toString();
 	const actorObj = {
 		"@context": [
 			"https://www.w3.org/ns/activitystreams",