diff --git a/paragraphs.info.yml b/paragraphs.info.yml
index 5b0e717..2702745 100644
--- a/paragraphs.info.yml
+++ b/paragraphs.info.yml
@@ -8,4 +8,5 @@ dependencies:
   - entity_reference_revisions
 test_dependencies:
   - diff
-  - replicate
\ No newline at end of file
+  - replicate
+  - inline_entity_form
\ No newline at end of file
diff --git a/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php b/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
index 5772c95..4c29867 100644
--- a/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
+++ b/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
@@ -1082,8 +1082,9 @@ class InlineParagraphsWidget extends WidgetBase {
 
         /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $display */
         $display =  $widget_state['paragraphs'][$item['_original_delta']]['display'];
-        $display->extractFormValues($paragraphs_entity, $element[$item['_original_delta']]['subform'], $form_state);
-
+        if ($widget_state['paragraphs'][$delta]['mode'] == 'edit') {
+          $display->extractFormValues($paragraphs_entity, $element[$item['_original_delta']]['subform'], $form_state);
+        }
         $paragraphs_entity->setNewRevision($new_revision);
         // A content entity form saves without any rebuild. It needs to set the
         // language to update it in case of language change.
diff --git a/src/Tests/ParagraphsInlineEntityFormTest.php b/src/Tests/ParagraphsInlineEntityFormTest.php
new file mode 100644
index 0000000..7a23b7a
--- /dev/null
+++ b/src/Tests/ParagraphsInlineEntityFormTest.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace Drupal\paragraphs\Tests;
+
+use Drupal\Core\Entity\Entity;
+use Drupal\field_ui\Tests\FieldUiTestTrait;
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests the configuration of paragraphs in relation to ief.
+ *
+ * @group paragraphs
+ */
+class ParagraphsInlineEntityFormTest extends WebTestBase {
+
+  use FieldUiTestTrait;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array(
+    'node',
+    'paragraphs',
+    'field',
+    'image',
+    'field_ui',
+    'block',
+    'inline_entity_form',
+  );
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    // Create paragraphs and article content types.
+    $this->drupalCreateContentType(array('type' => 'article', 'name' => 'Article'));
+    // Place the breadcrumb, tested in fieldUIAddNewField().
+    $this->drupalPlaceBlock('local_tasks_block');
+    $this->drupalPlaceBlock('local_actions_block');
+    $this->drupalPlaceBlock('system_breadcrumb_block');
+  }
+
+  /**
+   * Tests the revision of paragraphs.
+   */
+  public function testParagraphsIEFPreview() {
+    $admin_user = $this->drupalCreateUser(array(
+      'administer nodes',
+      'administer content types',
+      'administer node fields',
+      'administer node display',
+      'administer paragraphs types',
+      'administer paragraph fields',
+      'administer paragraph form display',
+      'administer node form display',
+      'create article content',
+      'edit any article content',
+      'delete any article content',
+    ));
+    $this->drupalLogin($admin_user);
+
+    $this->drupalGet('admin/structure/paragraphs_type');
+    $this->clickLink(t('Add paragraphs type'));
+    // Create paragraph type.
+    $edit = array(
+      'label' => 'Simple',
+      'id' => 'simple',
+    );
+    $this->drupalPostForm(NULL, $edit, t('Save and manage fields'));
+
+    // Create a reference to an article.
+    $this->fieldUIAddNewField('admin/structure/paragraphs_type/simple', 'article', 'Article', 'field_ui:entity_reference:node', array(
+      'settings[target_type]' => 'node',
+      'cardinality' => 'number',
+      'cardinality_number' => 1,
+    ), array(
+      'required' => TRUE,
+      'settings[handler_settings][target_bundles][article]' => TRUE
+    ));
+
+    // Enable IEF simple widget
+    $this->drupalGet('admin/structure/paragraphs_type/simple/form-display');
+    $edit = [
+      'fields[field_article][type]' => 'inline_entity_form_simple',
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+
+    // Create an article with paragraphs field.
+    static::fieldUIAddNewField('admin/structure/types/manage/article', 'paragraphs', 'Paragraphs', 'entity_reference_revisions', array(
+      'settings[target_type]' => 'paragraph',
+      'cardinality' => '-1',
+    ), array(
+      'settings[handler_settings][target_bundles_drag_drop][simple][enabled]' => TRUE,
+    ));
+
+    // Configure article fields.
+    $this->drupalGet('admin/structure/types/manage/article/form-display');
+    $this->drupalPostForm(NULL, array('fields[field_paragraphs][type]' => 'entity_reference_paragraphs'), t('Save'));
+
+    // Use paragraphs preview mode
+    $this->drupalPostAjaxForm(NULL, array(), 'field_paragraphs_settings_edit');
+    $edit = [
+      'fields[field_paragraphs][settings_edit_form][settings][edit_mode]' => 'preview',
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Update'));
+    $this->drupalPostForm(NULL, [], t('Save'));
+
+    // Create node with one paragraph.
+    $this->drupalGet('node/add/article');
+    $this->drupalPostAjaxForm(NULL, array(), 'field_paragraphs_simple_add_more');
+
+    // Set the value of the node and the paragraph.
+    $edit = [
+      'title[0][value]' => 'Dummy1',
+      'field_paragraphs[0][subform][field_article][0][inline_entity_form][title][0][value]' => 'Dummy2',
+    ];
+    // Save the article.
+    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
+
+    // Go back into edit page
+    $this->drupalGet('node/2/edit');
+
+    // Try to open the previewed paragraph.
+    $this->drupalPostAjaxForm(NULL, array(), 'field_paragraphs_0_edit');
+  }
+}