InvalidArgumentException: Invalid type boolean of value for field mtime

0. /var/www/nextcloud/lib/private/Files/Cache/QuerySearchHelper.php - line 122: OC\Files\Cache\QuerySearchHelper->validateComparison(Object(OC\Files\Search\SearchComparison))
1. /var/www/nextcloud/lib/private/Files/Cache/QuerySearchHelper.php - line 115: OC\Files\Cache\QuerySearchHelper->searchComparisonToDBExpr(Object(OC\DB\QueryBuilder\QueryBuilder), Object(OC\Files\Search\SearchComparison), Array)
2. /var/www/nextcloud/lib/private/Files/Cache/QuerySearchHelper.php - line 92: OC\Files\Cache\QuerySearchHelper->searchOperatorToDBExpr(Object(OC\DB\QueryBuilder\QueryBuilder), Object(OC\Files\Search\SearchComparison))
3. [internal function] OC\Files\Cache\QuerySearchHelper->OC\Files\Cache\{closure}(*** sensitive parameters replaced ***)
4. /var/www/nextcloud/lib/private/Files/Cache/QuerySearchHelper.php - line 93: array_map(Object(Closure), Array)
5. /var/www/nextcloud/lib/private/Files/Cache/QuerySearchHelper.php - line 108: OC\Files\Cache\QuerySearchHelper->searchOperatorArrayToDBExprArray(Object(OC\DB\QueryBuilder\QueryBuilder), Array)
6. /var/www/nextcloud/lib/private/Files/Cache/Cache.php - line 686: OC\Files\Cache\QuerySearchHelper->searchOperatorToDBExpr(Object(OC\DB\QueryBuilder\QueryBuilder), Object(OC\Files\Search\SearchBinaryOperator))
7. [internal function] OC\Files\Cache\Cache->searchQuery(Object(OC\Files\Search\SearchQuery))
8. /var/www/nextcloud/lib/private/Files/Node/Folder.php - line 245: call_user_func_array(Array, Array)
9. /var/www/nextcloud/lib/private/Files/Node/Folder.php - line 201: OC\Files\Node\Folder->searchCommon('searchQuery', Array)
10. /var/www/nextcloud/apps/dav/lib/Files/FileSearchBackend.php - line 159: OC\Files\Node\Folder->search(Object(OC\Files\Search\SearchQuery))
11. /var/www/nextcloud/3rdparty/icewind/searchdav/src/DAV/SearchHandler.php - line 75: OCA\DAV\Files\FileSearchBackend->search(Object(SearchDAV\XML\BasicSearch))
12. /var/www/nextcloud/3rdparty/icewind/searchdav/src/DAV/SearchPlugin.php - line 123: SearchDAV\DAV\SearchHandler->handleSearchRequest(Array, Object(Sabre\HTTP\Response))
13. [internal function] SearchDAV\DAV\SearchPlugin->searchHandler(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
14. /var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
15. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 479: Sabre\Event\EventEmitter->emit('method SEARCH', Array)
16. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
17. /var/www/nextcloud/apps/dav/lib/Server.php - line 287: Sabre\DAV\Server->exec()
18. /var/www/nextcloud/apps/dav/appinfo/v2/remote.php - line 35: OCA\DAV\Server->exec()
19. /var/www/nextcloud/remote.php - line 164: require_once('/var/www/nextcl...')
20. {main}