diff --git a/hnn_core/gui/gui.py b/hnn_core/gui/gui.py
index ca502a95c5..6d4975ef2e 100644
--- a/hnn_core/gui/gui.py
+++ b/hnn_core/gui/gui.py
@@ -1452,10 +1452,10 @@ def _serialize_simulation(log_out, sim_data, simulation_list_widget):
 
 def serialize_simulation(simulations_data, simulation_name):
     """Serializes simulation data to CSV.
-    
-        Creates a single CSV file or a ZIP file containing multiple CSVs, 
+
+        Creates a single CSV file or a ZIP file containing multiple CSVs,
         depending on the number of trials in the simulation.
-    
+
     """
     simulation_data = simulations_data["simulation_data"]
     csv_trials_output = []
diff --git a/hnn_core/tests/test_gui.py b/hnn_core/tests/test_gui.py
index e873724b2a..ff00f72ff6 100644
--- a/hnn_core/tests/test_gui.py
+++ b/hnn_core/tests/test_gui.py
@@ -625,8 +625,19 @@ def test_gui_upload_csv_simulation():
         file_url = 'file://' + absolute_path
     _ = gui._simulate_upload_data(file_url)
 
+    # we are loading only 1 trial,
+    # assume all the data we need is in the [0] position
+    data_lengh = (
+        len(gui.data['simulation_data']['test_default']['dpls'][0].times))
+
     assert len(gui.data['simulation_data']) == 1
     assert 'test_default' in gui.data['simulation_data'].keys()
     assert gui.data['simulation_data']['test_default']['net'] is None
     assert type(gui.data['simulation_data']['test_default']['dpls']) is list
     assert len(gui.viz_manager.data['figs']) == 1
+    assert (len(gui.data['simulation_data']['test_default']
+                ['dpls'][0].data['agg']) == data_lengh)
+    assert (len(gui.data['simulation_data']['test_default']
+                ['dpls'][0].data['L2']) == data_lengh)
+    assert (len(gui.data['simulation_data']['test_default']
+                ['dpls'][0].data['L5']) == data_lengh)