Fix error in book parsing
Fix error in book parsing

sunlianghua/gitbook,boyXiong/gitbook,megumiteam/documentation,iflyup/gitbook,CN-Sean/gitbook,haamop/documentation,gdbooks/gitbook,gaearon/gitbook,ZachLamb/gitbook,hujianfei1989/gitbook,bradparks/gitbook,tshoper/gitbook,ZachLamb/gitbook,snowsnail/gitbook,minghe/gitbook,sunlianghua/gitbook,tshoper/gitbook,hujianfei1989/gitbook,rohan07/gitbook,qingying5810/gitbook,FKV587/gitbook,mautic/documentation,jocr1627/gitbook,rohan07/gitbook,xcv58/gitbook,gencer/gitbook,bradparks/gitbook,qingying5810/gitbook,youprofit/gitbook,2390183798/gitbook,ferrior30/gitbook,minghe/gitbook,gencer/gitbook,ryanswanson/gitbook,vehar/gitbook,a-moses/gitbook,switchspan/gitbook,hongbinz/gitbook,wewelove/gitbook,OriPekelman/gitbook,megumiteam/documentation,CN-Sean/gitbook,kamyu104/gitbook,nycitt/gitbook,grokcoder/gitbook,gdbooks/gitbook,palerdot/gitbook,mruse/gitbook,JohnTroony/gitbook,mautic/documentation,FKV587/gitbook,jocr1627/gitbook,shibe97/gitbook,xxxhycl2010/gitbook,xxxhycl2010/gitbook,alex-dixon/gitbook,switchspan/gitbook,escopecz/documentation,boyXiong/gitbook,webwlsong/gitbook,snowsnail/gitbook,gaearon/gitbook,jasonslyvia/gitbook,shibe97/gitbook,JohnTroony/gitbook,justinleoye/gitbook,lucciano/gitbook,intfrr/gitbook,npracht/documentation,thelastmile/gitbook,guiquanz/gitbook,grokcoder/gitbook,sudobashme/gitbook,iamchenxin/gitbook,ferrior30/gitbook,a-moses/gitbook,jasonslyvia/gitbook,athiruban/gitbook,sudobashme/gitbook,lucciano/gitbook,tzq668766/gitbook,wewelove/gitbook,iflyup/gitbook,webwlsong/gitbook,nycitt/gitbook,alex-dixon/gitbook,justinleoye/gitbook,escopecz/documentation,npracht/documentation,intfrr/gitbook,youprofit/gitbook,strawluffy/gitbook,haamop/documentation,2390183798/gitbook,GitbookIO/gitbook,thelastmile/gitbook,palerdot/gitbook,iamchenxin/gitbook,mruse/gitbook,vehar/gitbook,OriPekelman/gitbook,guiquanz/gitbook,athiruban/gitbook,tzq668766/gitbook,kamyu104/gitbook,xcv58/gitbook,hongbinz/gitbook