fix segfault
fix segfault

iffy/AutobahnPython,Geoion/AutobahnPython,bencharb/AutobahnPython,nucular/AutobahnPython,iffy/AutobahnPython,iffy/AutobahnPython,dash-dash/AutobahnPython,iffy/AutobahnPython,schoonc/AutobahnPython,oberstet/autobahn-python,crossbario/autobahn-python,dash-dash/AutobahnPython,Jenselme/AutobahnPython,inirudebwoy/AutobahnPython,tomwire/AutobahnPython,dash-dash/AutobahnPython,claws/AutobahnPython,oberstet/autobahn-python,markope/AutobahnPython,meejah/AutobahnPython,jvdm/AutobahnPython,claws/AutobahnPython,tavendo/AutobahnPython,crossbario/autobahn-python,hzruandd/AutobahnPython,ttimon7/AutobahnPython,crossbario/autobahn-python,luhn/AutobahnPython,dash-dash/AutobahnPython,RyanHope/AutobahnPython,mcfletch/AutobahnPython,mcfletch/AutobahnPython,oberstet/autobahn-python