fix

server/product/internal/logic/getpricebypidlogic.go

@@ -116,7 +116,12 @@ func (l *GetPriceByPidLogic) dealWithStepRange(stepNumSlice, stepPriceSlice []in
 		end := int64(0)
 		if numKey == 0 { //第一个
 			begin = *priceInfo.MinBuyNum * (*priceInfo.EachBoxNum)
+			//只有一阶价格
+			if lenStepPrice == 1 {
+				end = -1
+			} else {
 				end = num - 1
+			}
 		} else if numKey < lenStepNum-1 { //中间的
 			nextNum := int64(stepNumSlice[numKey+1]) * (*priceInfo.EachBoxNum)
 			begin = num