Warning in Backend and Frontend

[GMTeams]

Contao 3.5.27
tags 4.0.2
PHP 7.0.29

I've changed from "contao-legacy/tags" to "hschottm/tags" and now I got the following warning message on top of the backend/frontend:

Warning: strpos(): Offset not contained in string in system/modules/tags/dca/tl_content.php on line 18 #0 [internal function]: __error(2, 'strpos(): Offse...', '/home/.sites/30...', 18, Array) #1 system/modules/tags/dca/tl_content.php(18): strpos('', '{', 2) #2 system/modules/core/library/Contao/DcaLoader.php(86): include('/home/.sites/30...') #3 composer/vendor/codefog/contao-haste/library/Haste/Model/Relations.php(515): Contao\DcaLoader->load() #4 system/modules/core/library/Contao/Database/Installer.php(410): Haste\Model\Relations->addRelationTables(Array) #5 system/modules/core/library/Contao/DcaExtractor.php(429): Contao\Database\Installer->getFromFile() #6 system/modules/core/library/Contao/DcaExtractor.php(128): Contao\DcaExtractor->createExtract() #7 system/modules/core/library/Contao/DcaExtractor.php(144): Contao\DcaExtractor->__construct('tl_page') #8 system/modules/core/library/Contao/Model/QueryBuilder.php(32): Contao\DcaExtractor::getInstance('tl_page') #9 system/modules/core/library/Contao/Model.php(1233): Contao\Model\QueryBuilder::find(Array) #10 system/modules/core/library/Contao/Model.php(1068): Contao\Model::buildFindQuery(Array) #11 system/modules/core/library/Contao/Model.php(796): Contao\Model::find(Array) #12 system/modules/core/models/PageModel.php(712): Contao\Model::findByPk('2') #13 composer/vendor/terminal42/contao-changelanguage/library/Terminal42/ChangeLanguage/EventListener/DataContainer/MissingLanguageIconListener.php(71): Contao\PageModel::findWithDetails('2') #14 composer/vendor/terminal42/contao-changelanguage/library/Terminal42/ChangeLanguage/EventListener/DataContainer/MissingLanguageIconListener.php(45): Terminal42\ChangeLanguage\EventListener\DataContainer\MissingLanguageIconListener->onPageLabel(Array, 'executeCallback(Object(Closure), Array) #18 system/modules/core/drivers/DC_Table.php(3736): Terminal42\ChangeLanguage\Helper\LabelCallback->Terminal42\ChangeLanguage\Helper\{closure}(Array, 'Home', Object(Contao\DC_Table), 'style="margin-l...', false, false) #19 system/modules/core/drivers/DC_Table.php(3827): Contao\DC_Table->generateTree('tl_page', '2', Array, true, 0, false, false, false) #20 system/modules/core/drivers/DC_Table.php(3394): Contao\DC_Table->generateTree('tl_page', '1', Array, true, -20, false, false, false, false) #21 system/modules/core/drivers/DC_Table.php(367): Contao\DC_Table->treeView() #22 system/modules/core/classes/Backend.php(650): Contao\DC_Table->showAll() #23 system/modules/core/controllers/BackendMain.php(131): Contao\Backend->getBackendModule('page') #24 contao/main.php(20): Contao\BackendMain->run() #25 {main}