diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwDefinitionServiceImpl.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwDefinitionServiceImpl.java
index a881ba692..591339b3e 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwDefinitionServiceImpl.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwDefinitionServiceImpl.java
@@ -107,7 +107,7 @@ public class FlwDefinitionServiceImpl implements IFlwDefinitionService {
         wrapper.like(StringUtils.isNotBlank(flowDefinition.getFlowName()), FlowDefinition::getFlowName, flowDefinition.getFlowName());
         if (StringUtils.isNotBlank(flowDefinition.getCategory())) {
             List<Long> categoryIds = flwCategoryMapper.selectCategoryIdsByParentId(Convert.toLong(flowDefinition.getCategory()));
-            wrapper.in(FlowDefinition::getCategory, categoryIds);
+            wrapper.in(FlowDefinition::getCategory, StreamUtils.toList(categoryIds, Convert::toStr));
         }
         wrapper.orderByDesc(FlowDefinition::getCreateTime);
         return wrapper;
diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwInstanceServiceImpl.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwInstanceServiceImpl.java
index b3421789c..db8ab71b9 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwInstanceServiceImpl.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwInstanceServiceImpl.java
@@ -138,7 +138,7 @@ public class FlwInstanceServiceImpl implements IFlwInstanceService {
         queryWrapper.like(StringUtils.isNotBlank(flowInstanceBo.getFlowCode()), "fd.flow_code", flowInstanceBo.getFlowCode());
         if (StringUtils.isNotBlank(flowInstanceBo.getCategory())) {
             List<Long> categoryIds = flwCategoryMapper.selectCategoryIdsByParentId(Convert.toLong(flowInstanceBo.getCategory()));
-            queryWrapper.in("fd.category", categoryIds);
+            queryWrapper.in("fd.category", StreamUtils.toList(categoryIds, Convert::toStr));
         }
         queryWrapper.eq(StringUtils.isNotBlank(flowInstanceBo.getBusinessId()), "fi.business_id", flowInstanceBo.getBusinessId());
         queryWrapper.in(CollUtil.isNotEmpty(flowInstanceBo.getCreateByIds()), "fi.create_by", flowInstanceBo.getCreateByIds());
diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskServiceImpl.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskServiceImpl.java
index 2df51bb3e..21a54d740 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskServiceImpl.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskServiceImpl.java
@@ -354,7 +354,7 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
         wrapper.in(CollUtil.isNotEmpty(flowTaskBo.getCreateByIds()), "t.create_by", flowTaskBo.getCreateByIds());
         if (StringUtils.isNotBlank(flowTaskBo.getCategory())) {
             List<Long> categoryIds = flwCategoryMapper.selectCategoryIdsByParentId(Convert.toLong(flowTaskBo.getCategory()));
-            wrapper.in("t.category", categoryIds);
+            wrapper.in("t.category", StreamUtils.toList(categoryIds, Convert::toStr));
         }
         wrapper.orderByDesc("t.create_time");
         return wrapper;