correct bug introduced with #6641 (#6665)
correct bug introduced with #6641 (#6665)


Markismus/koreader,pazos/koreader,Frenzie/koreader,Frenzie/koreader,koreader/koreader,poire-z/koreader,NiLuJe/koreader,koreader/koreader,NiLuJe/koreader,mwoz123/koreader,Hzj-jie/koreader,poire-z/koreader