Bond intruded into the Atoms in a Chemical structure

I’m using chemfig package for drawing chemical structure. However, in one chemical structure the bond intrudes into the atom. Is there any way to solve this?

documentclass{article}
usepackage[utf8]{inputenc}
usepackage{chemfig}
begin{document}

chemname{chemfig{C*6((-[4]H)-C(-[6]H)=C*6(-C(-[6]H)=C(-[0]H)-C(-[0]H)=C(-[2]H)-)-C=C(-[2]H)-C(-[4]H)=)}}{Naphthalin}

end{document}

documentclass{article}
usepackage{chemfig}
begin{document}

chemname{chemfig{
    C*6((-[4]H)-C(-[6]H)=C*6(-C(-[6]H)=C(-[0]H)-C(-[0]H)=C?(-[2]H))-C?=C(-[2]H)-C(-[4]H)=)
}}{Naphthalin}

end{document}