diff --git a/config_ignore.install b/config_ignore.install
index bdc7789..9381d7a 100644
--- a/config_ignore.install
+++ b/config_ignore.install
@@ -34,5 +34,6 @@ function config_ignore_update_8301() {
  */
 function config_ignore_update_8302() {
   $config = \Drupal::configFactory()->getEditable('config_ignore.settings');
-  $config->set('ignored_config_collections', [])->save();
+  $ignored_config_collections = $config->get('ignored_config_collections') ?: [];
+  $config->set('ignored_config_collections', $ignored_config_collections)->save();
 }