diff --git a/orgmanax-server/src/main/java/cn/axzo/orgmanax/server/cooperateship/service/impl/CooperateShipServiceImpl.java b/orgmanax-server/src/main/java/cn/axzo/orgmanax/server/cooperateship/service/impl/CooperateShipServiceImpl.java
index 296bfa3..4293879 100644
--- a/orgmanax-server/src/main/java/cn/axzo/orgmanax/server/cooperateship/service/impl/CooperateShipServiceImpl.java
+++ b/orgmanax-server/src/main/java/cn/axzo/orgmanax/server/cooperateship/service/impl/CooperateShipServiceImpl.java
@@ -232,7 +232,7 @@ public class CooperateShipServiceImpl implements CooperateShipService {
      * @return
      * @param <T>
      */
-    private <T> Collection<T> filterNullValues(Collection<T> collection) {
+    private <C extends Collection<T>, T> C filterNullValues(C collection) {
         if (CollUtil.isEmpty(collection)) {
             return collection;
         }