cubicweb #3401086 crash on cubiceb-ctl schema call [deprecated]

pagode@crater2:~/confs/pagode/cubes/pylos$ ctl  schema -w pagode
Traceback (most recent call last):
 File "/home/auc/bin/ctl", line 18, in <module>
   run(sys.argv[1:])
 File "/home/auc/confs/pagode/cubicweb/cwctl.py", line 1061, in run
   CWCTL.run(args)
 File "/home/auc/confs/pagode/logilab/common/clcommands.py", line 134, in run
   sys.exit(command.main_run(args, rcfile))
 File "/home/auc/confs/pagode/logilab/common/clcommands.py", line 263, in main_run
   self.run(args)
 File "/home/auc/confs/pagode/cubicweb/devtools/devctl.py", line 804, in run
   schema2dot.schema2dot(schema, out, skiptypes=skiptypes)
 File "/home/auc/confs/pagode/yams/schema2dot.py", line 212, in schema2dot
   return generator.generate(visitor, prophdlr, outputfile)
 File "/home/auc/confs/pagode/logilab/common/graph.py", line 165, in generate
   props = propshdlr.edge_properties(edge, subjnode, objnode)
 File "/home/auc/confs/pagode/yams/schema2dot.py", line 53, in edge_properties
   if rschema.symmetric:
AttributeError: 'NoneType' object has no attribute 'symmetric'
prioritynormal
typebug
done in3.17.12
load0.000
load left0.000
closed by<not specified>