diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/query/reducers.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/query/reducers.ts
index 7d3b9e4f..9f57a035 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/query/reducers.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/query/reducers.ts
@@ -49,7 +49,8 @@ export const reducer = createReducer(
     return {
       ...state,
       selectedDepartment: action,
-      selectedDepartmentProcessing: true
+      selectedDepartmentProcessing: true,
+      departmentUserInfoList: null
     };
   }),
   on(selectedDeptSuccess, (state, action) => {