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[Bug] Regarding the problem that the conversation record cannot be exported due to abnormal conversation content #4290

@sometimecry

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@sometimecry

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sometimecry@outlook.com

MaxKB Version

v1.10.10 lts

Problem Description

对话记录导出的问题,当遇到AI回答是502 gateway nginx,我点击导出对话记录无任何的反应,前端报错500 internal server error,查询系统报错内容是
TypeError: sequence item 0: expected str instance, NoneType found
10.128.20.121 [29/Oct/2025:17:10:09 +0800] 0.000944s "POST /api/application/cf2949f6-8964-11f0-bb6b-0242ac010002/chat/export?start_time=2025-10-22&end_time=2025-10-29&min_star=0&min_trample=0&comparer=and HTTP/1.1" 500 0

Steps to Reproduce

让对话内容出现异常值

The expected correct result

No response

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