Error: clean DOI: argument must be a string

Liuy811
When I tried to dowload a paper that the metadata wasn't extracted,and the tittle was "0".I deleted the paper and restarted it ,Zotero won't let me inand close after that.
Zotero gave me the following information:

Error: cleanDOI: argument must be a string
cleanDOI@chrome://zotero/content/xpcom/utilities/utilities.js:407:15
_cacheKeyMappings@chrome://zotero/content/xpcom/retractions.js:773:21
From previous event:
ZoteroService@file:///D:/Program%20Files%20(x86)/Zotero/components/zotero-service.js:346:7
@chrome://zotero/content/include.js:4:14

Is there anything I could do about it? Please help me.
Thanks
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