bug fix

src/main/java/com/huiju/estateagents/service/impl/TaRaiseServiceImpl.java

             wrapper.last("limit 1");
             taRaiseRecord = taRaiseRecordMapper.selectOne(wrapper);
 
-            if (taRaise == null) {
+            if (taRaise == null && taRaiseRecord != null) {
                 taRaise = this.getById(taRaiseRecord.getRaiseId());
             }
         }