diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomApproveTaskCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomApproveTaskCmd.java
index 80869add7..5308fe1d3 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomApproveTaskCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomApproveTaskCmd.java
@@ -220,16 +220,16 @@ public class CustomApproveTaskCmd extends AbstractCommand<Void> implements Seria
                 .setActivityId(task.getTaskDefinitionKey())
                 .setActivityName(task.getName())
                 .setSignatures(new ArrayList<>()));
-        ListUtils.emptyIfNull(attachmentList).stream()
-                .filter(i -> Objects.equals(i.getType(), AttachmentTypeEnum.signature))
-                .findFirst()
-                .ifPresent(attachment -> dto.getSignatures().add(0,
-                        new SignatureDTO.SignDetail()
-                                .setApproverName(approver.getAssignerName())
-                                .setSignature(attachment.getUrl())
-                                .setAdvice(advice)
-                                .setResult(BpmnProcessTaskResultEnum.APPROVED.getDesc())
-                                .setOperationTime(new Date())));
+
+        dto.getSignatures().add(0, new SignatureDTO.SignDetail()
+                .setApproverName(approver.getAssignerName())
+                .setSignature(ListUtils.emptyIfNull(attachmentList).stream()
+                        .filter(i -> Objects.equals(i.getType(), AttachmentTypeEnum.signature))
+                        .findFirst().orElse(new AttachmentDTO()).getUrl())
+                .setAdvice(advice)
+                .setResult(BpmnProcessTaskResultEnum.APPROVED.getDesc())
+                .setOperationTime(new Date())
+        );
         if (!any.isPresent()) {
             signatures.add(dto);
         }