# This patch addresses http://lists.bx.psu.edu/pipermail/galaxy-dev/2012-June/010303.html
--- a/templates/webapps/galaxy/workflow/run.mako
+++ b/templates/webapps/galaxy/workflow/run.mako
@@ -582,9 +582,12 @@
               # Filter possible inputs to data types that are valid for subsequent steps
               type_filter = []
               for oc in step.output_connections:
+                try:
                   for ic in oc.input_step.module.get_data_inputs():
                       if 'extensions' in ic and ic['name'] == oc.input_name:
                           type_filter += ic['extensions']
+                except AttributeError:
+                      pass
               if not type_filter:
                   type_filter = ['data']
               %>