I have a user (MacOS, Zotero 7.0.3) whose error log contains:
[JavaScript Error: "uncaught exception: undefined" {file: "chrome://zotero/content/xpcom/file.js" line: 335}]
[JavaScript Error: "InternalError: too much recursion" {file: "chrome://zotero/content/xpcom/utilities/date.js" line: 619}] [JavaScript Error: "InternalError: too much recursion" {file: "chrome://zotero/content/xpcom/db.js" line: 633}]
it doesn't seem to affect anything, but I have had similar errors recently and those were pretty severe. I tried to find what the lines corresponded to, seemed like it was regex calls, but that struck me as very strange, so maybe I got that wrong.