diff --git a/ruoyi-common/ruoyi-common-core/src/main/java/org/dromara/common/core/utils/StreamUtils.java b/ruoyi-common/ruoyi-common-core/src/main/java/org/dromara/common/core/utils/StreamUtils.java
index 1342deb71..f9e53a508 100644
--- a/ruoyi-common/ruoyi-common-core/src/main/java/org/dromara/common/core/utils/StreamUtils.java
+++ b/ruoyi-common/ruoyi-common-core/src/main/java/org/dromara/common/core/utils/StreamUtils.java
@@ -7,7 +7,6 @@ import lombok.NoArgsConstructor;
 
 import java.util.*;
 import java.util.function.BiFunction;
-import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDeptServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDeptServiceImpl.java
index fde4b875b..bfed848c6 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDeptServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDeptServiceImpl.java
@@ -128,9 +128,6 @@ public class SysDeptServiceImpl implements ISysDeptService, DeptService {
      */
     @Override
     public List<Tree<Long>> buildDeptTreeSelect(List<SysDeptVo> depts) {
-        if (CollUtil.isEmpty(depts)) {
-            return CollUtil.newArrayList();
-        }
         return TreeBuildUtils.buildMultiRoot(
             depts,
             SysDeptVo::getDeptId,
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysMenuServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysMenuServiceImpl.java
index 692b3ce00..08087ea71 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysMenuServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysMenuServiceImpl.java
@@ -248,9 +248,6 @@ public class SysMenuServiceImpl implements ISysMenuService {
      */
     @Override
     public List<Tree<Long>> buildMenuTreeSelect(List<SysMenuVo> menus) {
-        if (CollUtil.isEmpty(menus)) {
-            return CollUtil.newArrayList();
-        }
         return TreeBuildUtils.build(menus, (menu, tree) -> {
             Tree<Long> menuTree = tree.setId(menu.getMenuId())
                 .setParentId(menu.getParentId())
diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCategoryServiceImpl.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCategoryServiceImpl.java
index d42a48a2f..ff3784217 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCategoryServiceImpl.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCategoryServiceImpl.java
@@ -92,9 +92,6 @@ public class FlwCategoryServiceImpl implements IFlwCategoryService {
     @Override
     public List<Tree<String>> selectCategoryTreeList(FlowCategoryBo category) {
         List<FlowCategoryVo> categoryList = this.queryList(category);
-        if (CollUtil.isEmpty(categoryList)) {
-            return CollUtil.newArrayList();
-        }
         return TreeBuildUtils.buildMultiRoot(
             categoryList,
             node -> String.valueOf(node.getCategoryId()),