Zotero 5 Beta - Add citation not working

Hello,
I have been working with Zotero 5 Beta over a month without any problems. From yesterday, however, I can't insert citations. Everything displays normally, just the final OK button does not activate to insert the citation. I could not figure out what's the issue. Here is the error report ID: 752890033
Could you help me to solve this problem? Thank you!
(PS. I use the classic reference insertion display/view.)
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