diff --git a/packages/api/src/jobs/ai/create_digest.ts b/packages/api/src/jobs/ai/create_digest.ts
index 929b88581..d499dbf57 100644
--- a/packages/api/src/jobs/ai/create_digest.ts
+++ b/packages/api/src/jobs/ai/create_digest.ts
@@ -834,10 +834,12 @@ export const createDigest = async (jobData: CreateDigestData) => {
         title: item.libraryItem.title,
         id: item.libraryItem.id,
         url: getItemUrl(item.libraryItem.id),
-        thumbnail: item.libraryItem.thumbnail ?? undefined,
+        thumbnail: item.libraryItem.thumbnail
+          ? createThumbnailProxyUrl(item.libraryItem.thumbnail)
+          : undefined,
         wordCount: speechFiles[index].wordCount,
         html: summariesInHtml[index],
-        author: item.libraryItem.author ?? '',
+        author: item.libraryItem.author ?? undefined,
       })),
       createdAt: new Date(),
       description: '',
diff --git a/packages/api/src/services/digest.ts b/packages/api/src/services/digest.ts
index d1d5fa1c1..c44671a90 100644
--- a/packages/api/src/services/digest.ts
+++ b/packages/api/src/services/digest.ts
@@ -10,7 +10,7 @@ export interface Chapter {
   wordCount: number
   thumbnail?: string
   html: string
-  author: string
+  author?: string
 }
 
 export interface Digest {