core/modules/editor/editor.module | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/modules/editor/editor.module b/core/modules/editor/editor.module
index 18ff7f8351..d1a8bc7337 100644
--- a/core/modules/editor/editor.module
+++ b/core/modules/editor/editor.module
@@ -187,7 +187,7 @@ function editor_form_filter_admin_format_editor_configure($form, FormStateInterf
         'format' => $format->isNew() ? NULL : $format->id(),
         'editor' => $editor_value,
         'image_upload' => empty($editor)
-          ? NULL
+          ? []
           : $editor->getImageUploadSettings(),
       ]);
       $form_state->set('editor', $editor);