Errors when trying to rebuild index or index unindexed items

Hi, when I try to index unindexed items, nothing seems to happen. When I select individual attachments like Word documents in Zotero and try to Reindex Item individually, nothing happens. And then when I tried to rebuild the entire index, I get errors like these:

Warning: Unresponsive script

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: chrome://zotero/content/xpcom/db.js:773

Any advice?

My statistics are 272 indexed, 1 partial index, 200 unindexed

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