diff --git a/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx b/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx
index 77cdf7b4..b0b9a1e5 100644
--- a/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx
+++ b/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx
@@ -659,7 +659,7 @@ export default function StepUp(props) {
                                   <td
                                     className="al-r"
                                     onClick={() => {
-                                      handleRowClick(idx, serQtyIdx)
+                                      handleRowClick(idx, serQtyIdx, item.paralQty)
                                     }}
                                   >
                                     {item.serQty}
@@ -682,7 +682,11 @@ export default function StepUp(props) {
                                           </option>
                                         )}
                                         {Array.from(
-                                          { length: originPcsVoltageStepUpList[index].pcsItemList[idx].serQtyList[serQtyIdx].paralQty },
+                                          {
+                                            length: originPcsVoltageStepUpList[index]
+                                              ? originPcsVoltageStepUpList[index]?.pcsItemList[idx].serQtyList[serQtyIdx].paralQty
+                                              : item.paralQty,
+                                          },
                                           (_, i) => i + 1,
                                         ).map((num) => (
                                           <option key={num} value={num}>