From d00eb41f09fe349d2365adf604f4176b7b5c03fd Mon Sep 17 00:00:00 2001
From: Richard Christie <r.christie@auckland.ac.nz>
Date: Mon, 10 May 2021 16:49:56 +1200
Subject: [PATCH] Fix discover data coordinates field

---
 src/scaffoldfitter/fitter.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/scaffoldfitter/fitter.py b/src/scaffoldfitter/fitter.py
index f5495bd..2b63951 100644
--- a/src/scaffoldfitter/fitter.py
+++ b/src/scaffoldfitter/fitter.py
@@ -375,7 +375,7 @@ def _discoverDataCoordinatesField(self):
         field = None
         if self._dataCoordinatesFieldName:
             field = self._fieldmodule.findFieldByName(self._dataCoordinatesFieldName)
-        else:
+        if not ((field) and field.isValid()):
             datapoints = self._fieldmodule.findNodesetByFieldDomainType(Field.DOMAIN_TYPE_DATAPOINTS)
             datapoint = datapoints.createNodeiterator().next()
             if datapoint.isValid():