diff --git a/gixi/server/servers/save_data.py b/gixi/server/servers/save_data.py
index 1d6f4fa..212960f 100644
--- a/gixi/server/servers/save_data.py
+++ b/gixi/server/servers/save_data.py
@@ -31,7 +31,7 @@ def save_data(self, data_dict: dict):
         if data_dict:
             with self.time_recorder():
                 file_name = _get_path_name(paths[0], self.src_path)
-                data_dict = {k: data_dict[k] for k in self._keys}
+                data_dict = {k: data_dict[k] for k in self._keys if k in data_dict}
                 self.h5file.save(file_name, data_dict, attrs=dict(paths=path_names))