diff --git a/scenarionet/converter/nuplan/utils.py b/scenarionet/converter/nuplan/utils.py
index 7defe86..664c3da 100644
--- a/scenarionet/converter/nuplan/utils.py
+++ b/scenarionet/converter/nuplan/utils.py
@@ -40,7 +40,7 @@ except ImportError as e:
 EGO = "ego"
 
 
-def get_nuplan_scenarios(data_root, map_root, logs: Union[list, None], builder="nuplan_mini"):
+def get_nuplan_scenarios(data_root, map_root, logs: Union[list, None] = None, builder="nuplan_mini"):
     """
     Getting scenarios. You could use your parameters to get a bunch of scenarios
     :param data_root: path contains .db files, like /nuplan-v1.1/splits/mini
@@ -54,7 +54,7 @@ def get_nuplan_scenarios(data_root, map_root, logs: Union[list, None], builder="
     logs = logs or [file for file in os.listdir(data_root)]
     log_string = ""
     for log in logs:
-        log_string += log
+        log_string += log[:-3]  # remove .db
         log_string += ","
     log_string = log_string[:-1]
 
diff --git a/scenarionet/examples/convert_nuplan.py b/scenarionet/examples/convert_nuplan.py
index ec52c26..607b4fe 100644
--- a/scenarionet/examples/convert_nuplan.py
+++ b/scenarionet/examples/convert_nuplan.py
@@ -16,7 +16,8 @@ if __name__ == "__main__":
 
     data_root = os.path.join(os.getenv("NUPLAN_DATA_ROOT"), "nuplan-v1.1/splits/mini")
     map_root = os.getenv("NUPLAN_MAPS_ROOT")
-    scenarios = get_nuplan_scenarios(data_root, map_root, logs=["2021.07.16.20.45.29_veh-35_01095_01486"])
+    # scenarios = get_nuplan_scenarios(data_root, map_root, logs=["2021.07.16.20.45.29_veh-35_01095_01486"])
+    scenarios = get_nuplan_scenarios(data_root, map_root)
 
     write_to_directory(convert_func=convert_nuplan_scenario,
                        scenarios=scenarios,