diff --git a/doc/doxy2swig.py b/doc/doxy2swig.py

index 5589b0d..a01c4b1 100644

--- a/doc/doxy2swig.py

+++ b/doc/doxy2swig.py

@@ -299,7 +299,10 @@ class Doxy2SWIG:

             name = first['name'].firstChild.data

             for n in node.getElementsByTagName('param'):

-              arg_type = n.getElementsByTagName('type')[0]

+              elts = n.getElementsByTagName('type')

+              if len(elts) == 0:

+                  continue

+              arg_type = elts[0]

               ref = self.get_specific_nodes(arg_type, ('ref'))

               if 'ref' in ref:

                 type_name = ref['ref'].firstChild.data