diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index adfd720b..bbfd6ffb 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -1388,7 +1388,7 @@ def parsenonpainsled(fileformat,f2,summary):
     try:
         row = parsers[fileformat](f2)
         hasrecognized = True
-    except KeyError:
+    except (KeyError,IndexError):
         hasrecognized = False
         return None, hasrecognized, '', 'unknown'