diff --git a/src/main/java/com/chint/domain/aggregates/approval/ApprovalProcess.java b/src/main/java/com/chint/domain/aggregates/approval/ApprovalProcess.java
index 4964687c..25dc933c 100644
--- a/src/main/java/com/chint/domain/aggregates/approval/ApprovalProcess.java
+++ b/src/main/java/com/chint/domain/aggregates/approval/ApprovalProcess.java
@@ -58,7 +58,8 @@ public abstract class ApprovalProcess {
             ApprovalRecord approvalRecord = ApprovalRecord.of(routeOrder, this);
             List<Leg> legs = routeOrder.getLegItems()
                     .stream()
-                    .filter(legItem -> legItem.getLastEvent().getEventType().equals(LEG_APPROVAL_STATUS_PREPARE))
+                    .filter(leg -> leg.getLastEvent() != null &&
+                            leg.getLastEvent().getEventType().equals(LEG_APPROVAL_STATUS_PREPARE))
                     .toList();
             if (legs.isEmpty()) {
                 throw new CommandException("不存在需要审批的行程");