diff --git a/tinywiki/utils.py b/tinywiki/utils.py
index f1e13e3..7fd464d 100644
--- a/tinywiki/utils.py
+++ b/tinywiki/utils.py
@@ -215,8 +215,9 @@ def import_builtin_images(json_file: str | Path, user=None):
 
 
 def import_builtin_images_from_zip(zip: str | Path, user=None):
-    if isinstance(zip, str):
+    if not isinstance(zip, Path):
         zip = Path(zip).resolve()
+
     if not zip.exists():
         raise ValueError(f"File \"{zip}\" does not exist!")
     if not zip.isfile():
@@ -362,6 +363,7 @@ def export_wiki_content(app: str,
                 BuiltinImages.objects.create(app=app, prefix=prefix, version=image_version)
     return True
 
+
 def export_tinywiki_wiki_content(filename=None):
     if filename is None:
         filename = Path(django_settings.MEDIA_ROOT) / "tinywiki-tinywiki.zip"