diff --git a/interfaces/python/ck2cti.py b/interfaces/python/ck2cti.py
index e12d67b31..a2738c92d 100755
--- a/interfaces/python/ck2cti.py
+++ b/interfaces/python/ck2cti.py
@@ -1457,9 +1457,11 @@ def parseTransportData(lines, speciesList):
 
         speciesName = data[0]
         if speciesName in speciesDict:
-            if speciesDict[speciesName].transport is not None:
-                raise InputParseError('Duplicate transport data given for species "{0}".'.format(speciesName))
-            speciesDict[speciesName].transport = TransportData(*data)
+            if speciesDict[speciesName].transport is None:
+                speciesDict[speciesName].transport = TransportData(*data)
+            else:
+                logging.warning('Ignoring duplicate transport data'
+                                ' for species "{0}".'.format(speciesName))
 
 
 def writeCTI(elements,