swiper: add assert for next
swiper: add assert for next

dinfuehr/dora,riginding/dora,riginding/dora,dinfuehr/dora,riginding/dora,riginding/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora,riginding/dora