diff --git a/pandora_client/__init__.py b/pandora_client/__init__.py
index 298b1fa..9c8ff86 100755
--- a/pandora_client/__init__.py
+++ b/pandora_client/__init__.py
@@ -1109,6 +1109,7 @@ class API(ox.API):
 
     def upload_chunks(self, url, filename, data=None):
         resume = None
+        init_data = data
         if self._resume_file and os.path.exists(self._resume_file):
             with open(self._resume_file) as f:
                 try:
@@ -1123,7 +1124,7 @@ class API(ox.API):
             data = None
             while not data:
                 try:
-                    data = self._json_request(url, data)
+                    data = self._json_request(url, init_data)
                 except KeyboardInterrupt:
                     print("\ninterrupted by user.")
                     sys.exit(1)