diff --git a/src/Plugin/Field/FieldWidget/OptionsShsWidget.php b/src/Plugin/Field/FieldWidget/OptionsShsWidget.php
index fd9171903bd697f440017f01d6eec99a3a39ed92..5b09ceb6b43f53feac4d7aaf7548de302fbde1c3 100644
--- a/src/Plugin/Field/FieldWidget/OptionsShsWidget.php
+++ b/src/Plugin/Field/FieldWidget/OptionsShsWidget.php
@@ -338,6 +338,9 @@ class OptionsShsWidget extends OptionsSelectWidget implements ContainerFactoryPl
       return;
     }
     $value = $element['#value'];
+    if (is_string($value)) {
+      $value = explode(' ', $value);
+    }
     if (!is_array($value)) {
       $value = [$value];
     }