ruoyi-system/src/main/java/com/ruoyi/wisdomarbitrate/service/mscase/impl/MsSignSealServiceImpl.java

                     caseNodeTime= DateUtil.format(record.getCreateTime(), DatePattern.NORM_DATETIME_FORMATTER);
                 }
                 Integer caseNode = record.getCaseNode();
-                contentBuilder.append(Optional.ofNullable(record.getCreateNickName()).orElse("")).append("(").append(record.getCreateBy()).append(")").append("于").append(caseNodeTime);
+                String createBy = record.getCreateBy();
+                if(StrUtil.isNotEmpty(createBy)){
+                    contentBuilder.append(Optional.ofNullable(record.getCreateNickName()).orElse("")).append("(").append(record.getCreateBy()).append(")").append("于").append(caseNodeTime);
+                }else{
+                    contentBuilder.append(Optional.ofNullable(record.getCreateNickName()).orElse("")).append("于").append(caseNodeTime);
+                }
+
                 if(StrUtil.isNotEmpty(record.getContent())){
                     contentBuilder.append(record.getContent());
                 }else if(caseNode.intValue() == 0){