Use bundle method.

plugins/FeedsTermProcessor.inc

@@ -176,7 +176,7 @@ class FeedsTermProcessor extends FeedsProcessor {
     try {
       self::loadMappers();
       $entity_type = $this->entityType();
-      $bundle = $this->vocabulary()->machine_name;
+      $bundle = $this->bundle();
       drupal_alter('feeds_processor_targets', $targets, $entity_type, $bundle);
     }
     catch (Exception $e) {

plugins/FeedsUserProcessor.inc

@@ -196,7 +196,7 @@ class FeedsUserProcessor extends FeedsProcessor {
     // Let other modules expose mapping targets.
     self::loadMappers();
     $entity_type = $this->entityType();
-    $bundle = $this->entityType();
+    $bundle = $this->bundle();
     drupal_alter('feeds_processor_targets', $targets, $entity_type, $bundle);
 
     return $targets;