diff -u b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php --- b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php +++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php @@ -524,7 +524,7 @@ $system_data = $form_state->get('system_data'); // Remove core profiles from the system data. foreach (['standard', 'minimal'] as $profile) { - unset($system_data[$profile]); + unset($system_data['module'][$profile]); } $unmigrated_source_modules = array_diff_key($system_data['module'], $table_data);