fix #6206: NPE in router
fix #6206: NPE in router

S-Bartfast/cgeo,cgeo/cgeo,superspindel/cgeo,tobiasge/cgeo,matej116/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo,Bananeweizen/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,S-Bartfast/cgeo,S-Bartfast/cgeo,auricgoldfinger/cgeo,pstorch/cgeo,Bananeweizen/cgeo,cgeo/cgeo,kumy/cgeo,auricgoldfinger/cgeo,superspindel/cgeo,matej116/cgeo,pstorch/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,matej116/cgeo,superspindel/cgeo,kumy/cgeo,kumy/cgeo,auricgoldfinger/cgeo,Bananeweizen/cgeo,tobiasge/cgeo,pstorch/cgeo