#0 [internal function]: __error(2, 'array_merge(): ...', '/homepages/7/d1...', 198, Array)
#1 …/system/modules/core/library/Contao/Session.php(198): array_merge(NULL, Array)
#2 …/system/modules/a1shop/classes/a1_shop.php(80): Contao\Session->appendData(Array)
#3 …/system/modules/a1shop/modules/a1_partner_direktwahl.php(21): a1_shop->setMandant('1')
#4 …/system/modules/core/modules/Module.php(148): a1_partner_direktwahl->compile()
#5 …/system/modules/core/elements/ContentModule.php(63): Contao\Module->generate()
#6 …/system/modules/core/library/Contao/Controller.php(456): Contao\ContentModule->generate()
#7 …/system/modules/core/modules/ModuleArticle.php(179): Contao\Controller->getContentElement(Object(Contao\Model\Collection))
#8 …/system/modules/core/modules/Module.php(148): Contao\ModuleArticle->compile()
#9 …/system/modules/core/modules/ModuleArticle.php(59): Contao\Module->generate()
#10 …/system/modules/core/library/Contao/Controller.php(384): Contao\ModuleArticle->generate(false)
#11 …/system/modules/core/library/Contao/Controller.php(237): Contao\Controller->getArticle(Object(Contao\Model\Collection), false, false, 'main')
#12 …/system/modules/core/pages/PageRegular.php(109): Contao\Controller->getFrontendModule('0', 'main')
#13 …/index.php(250): Contao\PageRegular->generate(Object(Contao\PageModel))
#14 …/index.php(411): Index->run()
#15 {main}