$extensions = unserialize($extensions);
$connection->update('config')
->fields([
- 'data' => serialize(array_merge_recursive($extensions, ['theme' => ['test_stable' => 0]]))
+ 'data' => serialize(array_merge_recursive($extensions, ['theme' => ['test_stable' => 0]])),
])
->condition('name', 'core.extension')
->execute();