fixed class cast exception in json parsing
fixed class cast exception in json parsing

fimkrypto/nxt,metrospark/czarcraft,duckx/nxt,fimkrypto/nxt,Ziftr/nxt,duckx/nxt,metrospark/czarcraft,Ziftr/nxt,fimkrypto/nxt,duckx/nxt,fimkrypto/nxt,Ziftr/nxt,metrospark/czarcraft