diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomOverrideProcessVariablesCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomOverrideProcessVariablesCmd.java
index c9f57714b..3a49e6ee1 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomOverrideProcessVariablesCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomOverrideProcessVariablesCmd.java
@@ -51,7 +51,7 @@ public class CustomOverrideProcessVariablesCmd extends AbstractCommand<Void> imp
         RuntimeService runtimeService = processEngineConfiguration.getRuntimeService();
 
         ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
-        if (Objects.nonNull(processInstance)) {
+        if (Objects.isNull(processInstance)) {
             throw new WorkflowEngineException(PROCESS_INSTANCE_NOT_EXISTS);
         }