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TypeError: Cannot access offset of type array on array in Drupal\Core\Database\Query\Merge->key() (line 331 of core/lib/Drupal/Core/Database/Query/Merge.php).

Drupal\Core\Database\Query\Merge->key() (Line: 216)
Drupal\wisski_statistics\Statistics\WisskiStatistics->update() (Line: 27)
wisski_statistics_cron() (Line: 275)
Drupal\Core\Cron->Drupal\Core\{closure}() (Line: 357)
Drupal\Core\Extension\ModuleHandler->invokeAllWith() (Line: 258)
Drupal\Core\Cron->invokeCronHandlers() (Line: 97)
Drupal\Core\Cron->run() (Line: 37)
Drupal\automated_cron\EventSubscriber\AutomatedCron->onTerminate() (Line: 246)
Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}() (Line: 206)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners() (Line: 56)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch() (Line: 114)
Symfony\Component\HttpKernel\HttpKernel->terminate() (Line: 63)
Drupal\Core\StackMiddleware\StackedHttpKernel->terminate() (Line: 689)
Drupal\Core\DrupalKernel->terminate() (Line: 22)