diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/listener/task/FirstCopyTemplateFileTaskEvent_105_Listener.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/listener/task/FirstCopyTemplateFileTaskEvent_105_Listener.java
index eff5133be..c3b92d006 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/listener/task/FirstCopyTemplateFileTaskEvent_105_Listener.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/listener/task/FirstCopyTemplateFileTaskEvent_105_Listener.java
@@ -22,6 +22,7 @@ import cn.axzo.workflow.core.service.ExtAxReModelService;
 import cn.axzo.workflow.server.common.util.RpcExternalUtil;
 import cn.axzo.workflow.server.common.util.WpsUtil;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.collections4.ListUtils;
 import org.flowable.bpmn.model.Process;
 import org.flowable.common.engine.impl.interceptor.CommandExecutor;
 import org.flowable.engine.RuntimeService;
@@ -102,7 +103,7 @@ public class FirstCopyTemplateFileTaskEvent_105_Listener extends AbstractBpmnEve
 
         // 业务自定义文档
         RuntimeService runtimeService = processEngineConfiguration.getRuntimeService();
-        List<CustomDocDTO> customDocs = runtimeService.getVariable(processInstanceId, SIGN_BIZ_CUSTOM_DOCS, List.class);
+        List<CustomDocDTO> customDocs = ListUtils.emptyIfNull(runtimeService.getVariable(processInstanceId, SIGN_BIZ_CUSTOM_DOCS, List.class));
 
         if (CollectionUtils.isEmpty(docs)) {
             processSign.setDocTemplate(Collections.emptyList());