diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldTypeDefaults.php b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldTypeDefaults.php
index 0deedd0..0e34add 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldTypeDefaults.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldTypeDefaults.php
@@ -8,6 +8,7 @@
 namespace Drupal\migrate_drupal\Plugin\migrate\process\d6;
 
 use Drupal\migrate\MigrateException;
+use Drupal\migrate\MigrateSkipRowException;
 use Drupal\migrate\ProcessPluginBase;
 use Drupal\migrate\MigrateExecutable;
 use Drupal\migrate\Row;
@@ -30,7 +31,7 @@ public function transform($value, MigrateExecutable $migrate_executable, Row $ro
         $value = 'datetime_default';
       }
       else {
-        throw new MigrateException(sprintf('Failed to lookup %s in the static map.', var_export($value, TRUE)));
+        throw new MigrateSkipRowException();
       }
     }
     return $value;