diff --git a/src/Plugin/Field/FieldType/SmartDateListItemBase.php b/src/Plugin/Field/FieldType/SmartDateListItemBase.php
index 3c4c549..b5c451e 100644
--- a/src/Plugin/Field/FieldType/SmartDateListItemBase.php
+++ b/src/Plugin/Field/FieldType/SmartDateListItemBase.php
@@ -14,7 +14,10 @@ abstract class SmartDateListItemBase extends ListItemBase {
    */
   public static function parseValues($values) {
     // Use the ListItemBase parsing function, but don't allow generated keys.
-    $result = static::extractAllowedValues($values, 1);
+    $list = explode("\n", $values);
+    $list = array_map('trim', $list);
+    $list = array_filter($list, 'strlen');
+    $result = static::extractAllowedValues($list, 1);
     return $result;
   }