fix None error
fix None error

schieb/angr,axt/angr,f-prettyland/angr,chubbymaggie/angr,axt/angr,angr/angr,iamahuman/angr,f-prettyland/angr,axt/angr,chubbymaggie/angr,iamahuman/angr,chubbymaggie/angr,angr/angr,schieb/angr,tyb0807/angr,schieb/angr,tyb0807/angr,iamahuman/angr,f-prettyland/angr,tyb0807/angr,angr/angr