diff --git a/src/main/java/com/budwk/app/sys/models/Sys_user.java b/src/main/java/com/budwk/app/sys/models/Sys_user.java
index 0869852..01900d5 100644
--- a/src/main/java/com/budwk/app/sys/models/Sys_user.java
+++ b/src/main/java/com/budwk/app/sys/models/Sys_user.java
@@ -223,7 +223,6 @@ public class Sys_user extends BaseModel implements Serializable {
     @Column
     @Comment("预计离校时间/最后离校时间")
     @ColDefine(type = ColType.DATE)
-    @DataCenterColumn(name = "预计离校时间/最后离校时间", key = "LXRQ")
     private Date expectedLeaveSchoolDate;
 
     @Column
diff --git a/src/main/java/com/budwk/app/sys/services/impl/SysDataUserAllUpdateServiceImpl.java b/src/main/java/com/budwk/app/sys/services/impl/SysDataUserAllUpdateServiceImpl.java
index 766a668..8dc0223 100644
--- a/src/main/java/com/budwk/app/sys/services/impl/SysDataUserAllUpdateServiceImpl.java
+++ b/src/main/java/com/budwk/app/sys/services/impl/SysDataUserAllUpdateServiceImpl.java
@@ -508,8 +508,9 @@ public class SysDataUserAllUpdateServiceImpl implements SysDataUserUpdateService
             NutMap change = NutMap.NEW();
             change.put("fieldName", "单位");
             change.put("field", "unitId");
-            change.put("sourceValue", unitIdNameMap.get(user.getUnitId()));
-            change.put("newValue", unitIdNameMap.get(user.getUnitId()));
+            // 原单位或新单位可能为空、或暂未同步到单位表，使用空字符串避免生成历史记录时触发空指针。
+            change.put("sourceValue", StrUtil.blankToDefault(unitIdNameMap.get(user.getUnitId()), ""));
+            change.put("newValue", StrUtil.blankToDefault(unitIdNameMap.get(source.getUnitId()), ""));
             changeList.add(change);
 
             // 单位异动发送订阅消息，清空原单位的所有角色