guard against null worker
guard against null worker

Antaiseito/throneteki_for_doomtown,jbrz/throneteki,cryogen/gameteki,cryogen/throneteki,ystros/throneteki,gryffon/ringteki,DukeTax/throneteki,cryogen/gameteki,jbrz/throneteki,gryffon/ringteki,Antaiseito/throneteki_for_doomtown,DukeTax/throneteki,cryogen/throneteki,jeremylarner/ringteki,gryffon/ringteki,samuellinde/throneteki,samuellinde/throneteki,jeremylarner/ringteki,jeremylarner/ringteki