diff --git a/bind/G4Calo.py b/bind/G4Calo.py
index eb93c4d..e59c21a 100644
--- a/bind/G4Calo.py
+++ b/bind/G4Calo.py
@@ -462,15 +462,17 @@ Example
     sw.reset()
     sw.start()
     df = None
+    steps_df = None
     try:
         df = _assemble_results_to_mini_df(rp)
-    finally: #make sure to delete temp files
+        if return_steps:
+            steps_df = _assemble_results_to_mini_df(rp, tree_name="Steps")
+    finally:
         for f in tmpfile:
             if os.path.exists(f):
                 os.remove(f)
     print('G4Calo: concatenation finished after {:.2f} seconds'.format(sw.elapsed()))
     if return_steps:
-        steps_df = _assemble_results_to_mini_df(rp, tree_name="Steps")
         return df, steps_df
     return df