diff --git a/.changeset/nervous-sloths-wash.md b/.changeset/nervous-sloths-wash.md
new file mode 100644
index 0000000000..adb8387c3d
--- /dev/null
+++ b/.changeset/nervous-sloths-wash.md
@@ -0,0 +1,5 @@
+---
+'@shopify/cli-kit': patch
+---
+
+Fix a bug when building empty theme assets
diff --git a/packages/cli-kit/src/public/node/themes/factories.ts b/packages/cli-kit/src/public/node/themes/factories.ts
index 02d5605de0..7652c09ef1 100644
--- a/packages/cli-kit/src/public/node/themes/factories.ts
+++ b/packages/cli-kit/src/public/node/themes/factories.ts
@@ -12,7 +12,8 @@ interface RemoteThemeResponse {
 interface RemoteAssetResponse {
   key: string
   checksum: string
-  attachment: string
+  attachment: string | undefined
+  // value is an empty string ('') when the file is empty
   value: string
 }
 
@@ -52,8 +53,7 @@ export function buildThemeAsset(asset?: RemoteAssetResponse): ThemeAsset | undef
 
   const {key, checksum, attachment, value} = asset
   // Note: for attachments, this is the size of the base64 string, not the real length of the file
-  const stats = {size: (value || attachment).length, mtime: Date.now()}
-
+  const stats = {size: (value || attachment || '').length, mtime: Date.now()}
   return {key, checksum, attachment, value, stats}
 }