988495745

[JavaScript Error: "[Exception... "'[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [mozIStorageStatement.execute]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: anonymous :: line 139" data: no] [QUERY: UPDATE tags SET name=?, type=?, dateAdded=?, dateModified=?, clientDateModified=?, libraryID=?, key=? WHERE tagID=?] [ERROR: constraint failed]' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]"]

[JavaScript Error: "[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [mozIStorageStatement.execute]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: anonymous :: line 139" data: no] [QUERY: UPDATE tags SET name=?, type=?, dateAdded=?, dateModified=?, clientDateModified=?, libraryID=?, key=? WHERE tagID=?] [ERROR: constraint failed]" {file: "chrome://zotero/content/xpcom/sync.js" line: 872}]

any advice please
S Murray