diff --git a/src/napatrackmater/Trackvector.py b/src/napatrackmater/Trackvector.py
index e70cb09f..f0f71ad8 100644
--- a/src/napatrackmater/Trackvector.py
+++ b/src/napatrackmater/Trackvector.py
@@ -482,7 +482,7 @@ def plot_mitosis_times(self, full_dataframe, save_path=""):
             all_split_data.append(data)
 
         np.save(
-                        f"{save_path}_{column}_data_at_mitosis_time.npy", data
+                        f"{save_path}_data_at_mitosis_time.npy", all_split_data
                     )            
 
     def get_shape_dynamic_feature_dataframe(self):