diff --git a/api/src/channel/lib/Handler.ts b/api/src/channel/lib/Handler.ts
index 7e87676d..3d76f47e 100644
--- a/api/src/channel/lib/Handler.ts
+++ b/api/src/channel/lib/Handler.ts
@@ -309,7 +309,7 @@ export default abstract class ChannelHandler<
    */
   public async getPublicUrl(attachment: AttachmentRef | Attachment) {
     const [name, _suffix] = this.getName().split('-');
-    if ('id' in attachment) {
+    if (attachment && 'id' in attachment) {
       if (!attachment || !attachment.id) {
         this.logger.warn('Unable to build public URL: Empty attachment ID');
         return buildURL(config.apiBaseUrl, `/webhook/${name}/not-found`);