diff --git a/updog/__main__.py b/updog/__main__.py
index 44aa187..239fef2 100644
--- a/updog/__main__.py
+++ b/updog/__main__.py
@@ -129,7 +129,7 @@ def main():
 
             path = request.form['path']
             # Prevent file upload to paths outside of base directory
-            if not is_valid_subpath(path, base_directory):
+            if not is_valid_subpath(path, base_directory) or path == '':
                 return redirect(request.referrer)
 
             for file in request.files.getlist('file'):