diff --git a/web/run.py b/web/run.py
index dbb512b..9fe4325 100755
--- a/web/run.py
+++ b/web/run.py
@@ -939,8 +939,10 @@ def generate_csv_contents_spz(target_slug, input_slug, started_at, stopped_at):
 
     from math import sqrt
     final_df = pd.concat(list_df, axis=1)
-    # Is ther a vtot param ? else build it
-    if 'vtot' not in final_df.columns:
+    # build vtot param  if doesnt exist
+    if 'vtot' not in final_df.columns \
+            and 'vtan' in final_df.columns \
+            and 'vrad' in final_df.columns:
         final_df['vtot'] = final_df.apply(lambda x: sqrt(x.vtan * x.vtan + x.vrad * x.vrad), axis=1)
 
     cols_ordered = ['vrad', 'vtan', 'vtot', 'btan', 'brad', 'temp', 'pdyn', 'dens', 'atse', 'xhee', 'yhee']
--
libgit2 0.21.2