diff --git a/packages/pl-api/lib/entities/account.ts b/packages/pl-api/lib/entities/account.ts
index 50d9ac030..3680c77dc 100644
--- a/packages/pl-api/lib/entities/account.ts
+++ b/packages/pl-api/lib/entities/account.ts
@@ -31,8 +31,8 @@ const preprocessAccount = v.transform((account: any) => {
     domain,
     avatar: account.avatar || account.avatar_static,
     header: account.header || account.header_static,
-    avatar_default: isDefaultAvatar(account.avatar || account.avatar_static),
-    header_default: isDefaultHeader(account.header || account.header_static),
+    avatar_default: isDefaultAvatar(account.avatar || account.avatar_static || ''),
+    header_default: isDefaultHeader(account.header || account.header_static || ''),
     local: typeof account.pleroma?.is_local === 'boolean' ? account.pleroma.is_local : account.acct.split('@')[1] === undefined,
     discoverable: account.discoverable || account.pleroma?.source?.discoverable,
     verified: account.verified || account.pleroma?.tags?.includes('verified'),
diff --git a/packages/pl-api/lib/entities/group.ts b/packages/pl-api/lib/entities/group.ts
index 377f7f94e..a46d8369a 100644
--- a/packages/pl-api/lib/entities/group.ts
+++ b/packages/pl-api/lib/entities/group.ts
@@ -36,8 +36,8 @@ const groupSchema = v.pipe(v.any(), v.transform((group: any) => {
     ...group,
     avatar: group.avatar || group.avatar_static,
     header: group.header || group.header_static,
-    avatar_default: isDefaultAvatar(group.avatar || group.avatar_static),
-    header_default: isDefaultHeader(group.header || group.header_static),
+    avatar_default: isDefaultAvatar(group.avatar || group.avatar_static || ''),
+    header_default: isDefaultHeader(group.header || group.header_static || ''),
   };
 }), v.object({
   avatar: v.fallback(v.string(), ''),