diff --git a/reduction_tools/cat_lst.py b/reduction_tools/cat_lst.py
index b1b8118..9590458 100644
--- a/reduction_tools/cat_lst.py
+++ b/reduction_tools/cat_lst.py
@@ -90,15 +90,21 @@ def generate_lst_df( run_lst, endstation, label, pgroup ):
     # make df of lsts to be concatenated
     lst_df = pd.DataFrame()
 
+
     for index, row in range_df.iterrows():
         
         # get approximate dir pwd
         lst_app_dir = row[ "lst_app_dir" ]
-        # find matching file
-        lst_dir = glob.glob( lst_app_dir )
 
-        # find lsts in lst directory depending on label
-        lst_dir_df = find_lst( lst_dir[0], label )
+        # find matching file
+        try:
+            lst_dir = glob.glob( lst_app_dir )
+
+            # find lsts in lst directory depending on label
+            lst_dir_df = find_lst( lst_dir[0], label )
+            
+        except IndexError:
+            lst_dir_df = pd.DataFrame()
 
         # append lst dir dfs
         lst_df = pd.concat( [ lst_df, lst_dir_df ], ignore_index=True )
@@ -144,7 +150,7 @@ if __name__ == "__main__":
     parser.add_argument(
         "-p",
         "--pgroup",
-        help="pgroup the data are collected in - in form p#####",
+        help="pgroup the data are collected in",
         type=str
         )
     parser.add_argument(
@@ -157,7 +163,7 @@ if __name__ == "__main__":
     parser.add_argument(
         "-o",
         "--output",
-        help="name of output file - script will add .lst",
+        help="name of output file",
         type=str,
         )
     args = parser.parse_args()
@@ -177,3 +183,4 @@ if __name__ == "__main__":
     # run main
     main( run_lst, args.endstation, args.label, args.pgroup, args.output )
     print( "done" )
+