diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmProcessInstanceServiceImpl.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmProcessInstanceServiceImpl.java
index 1b9fdabeb..03c9856eb 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmProcessInstanceServiceImpl.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmProcessInstanceServiceImpl.java
@@ -74,7 +74,7 @@ public class BpmProcessInstanceServiceImpl implements BpmProcessInstanceService
                                                            @Nullable Boolean hasVariable) {
         ProcessInstanceQuery instanceQuery =
                 runtimeService.createProcessInstanceQuery().processInstanceBusinessKey(businessKey);
-        if (Boolean.TRUE.equals(hasVariable)) {
+        if (Objects.nonNull(hasVariable) && Boolean.TRUE.equals(hasVariable)) {
             instanceQuery.includeProcessVariables();
         }
         if (StringUtils.isNotBlank(tenantId)) {
@@ -103,7 +103,7 @@ public class BpmProcessInstanceServiceImpl implements BpmProcessInstanceService
     @Override
     public ProcessInstance getProcessInstance(String id, String tenantId, Boolean hasVariable) {
         ProcessInstanceQuery instanceQuery = runtimeService.createProcessInstanceQuery().processInstanceId(id);
-        if (Boolean.TRUE.equals(hasVariable)) {
+        if (Objects.nonNull(hasVariable) && Boolean.TRUE.equals(hasVariable)) {
             instanceQuery.includeProcessVariables();
         }
         if (StringUtils.isNotBlank(tenantId)) {