diff --git a/multiversion.module b/multiversion.module
index 144be4d..17b521a 100644
--- a/multiversion.module
+++ b/multiversion.module
@@ -67,7 +67,7 @@ function multiversion_entity_type_alter(array &$entity_types) {
           $entity_type->setHandlerClass('storage', "$namespace\\MediaStorage");
           $entity_type->setHandlerClass('storage_schema', "$namespace\\ContentEntityStorageSchema");
           break;
-        
+
         case 'paragraph':
           $entity_type->setHandlerClass('storage', "$namespace\\ParagraphsStorage");
           $entity_type->setHandlerClass('storage_schema', "$namespace\\ParagraphsStorageSchema");
diff --git a/src/Entity/Storage/Sql/ParagraphsStorage.php b/src/Entity/Storage/Sql/ParagraphsStorage.php
index 6032cfc..80235d1 100644
--- a/src/Entity/Storage/Sql/ParagraphsStorage.php
+++ b/src/Entity/Storage/Sql/ParagraphsStorage.php
@@ -13,6 +13,9 @@ class ParagraphsStorage extends SqlContentEntityStorage implements ContentEntity
     save as saveEntity;
   }
 
+  /**
+   * {@inheritdoc}
+   */
   public function save(EntityInterface $entity) {
     $result = $this->saveEntity($entity);
     $this->updateRevIds($entity);
@@ -20,10 +23,12 @@ public function save(EntityInterface $entity) {
     return $result;
   }
 
-  // change revision id the parent entity links to
+  /**
+   * Assign the revision ID to the value the parent entity uses.
+   */
   private function updateRevIds($entity) {
-    // test if entity has parent
-    if($parent_entity = $entity->getParentEntity()){
+    // Test if entity has parent.
+    if ($parent_entity = $entity->getParentEntity()){
       $parent_entity_id = $parent_entity->id();
       $parent_entity_rev_id = $parent_entity->getRevisionId();
       $parent_entity_type = $parent_entity->getEntityTypeId();
@@ -32,23 +37,25 @@ private function updateRevIds($entity) {
       $entity_id = $entity->id();
       $entity_rev_id = $entity->getRevisionId();
 
-      if(!$parent_entity_id   ||
-        !$parent_entity_type  ||
-        !$parent_entity_field_name   ||
-        !$entity_id           ||
-        !$entity_rev_id) return NULL;
+      if (empty($parent_entity_id)
+        || empty($parent_entity_type)
+        || empty($parent_entity_field_name)
+        || empty($entity_id)
+        || empty($entity_rev_id)) {
+        return NULL;
+      }
 
-      // set newest revision id in parent field table
+      // Set newest revision ID in parent field table.
       $db = \Drupal::database();
 
-      // address normal and revision tables
+      // Address normal and revision tables.
       foreach (['', '_revision'] as $table) {
         $query = $db
           ->update($parent_entity_type . $table . '__' . $parent_entity_field_name)
           ->fields(["{$parent_entity_field_name}_target_revision_id" => $entity_rev_id])
           ->condition("{$parent_entity_field_name}_target_id", $entity_id);
 
-        if($table === '_revision') {
+        if ($table === '_revision') {
           $query
             ->condition('entity_id', $parent_entity_id)
             ->condition('revision_id', $parent_entity_rev_id);
@@ -60,4 +67,5 @@ private function updateRevIds($entity) {
       \Drupal::service('cache_tags.invalidator')->invalidateTags((array) $parent_entity->getCacheTagsToInvalidate());
     }
   }
+
 }
diff --git a/src/EntityReferenceRevisionsItem.php b/src/EntityReferenceRevisionsItem.php
index 0f0f190..4d8bcc1 100644
--- a/src/EntityReferenceRevisionsItem.php
+++ b/src/EntityReferenceRevisionsItem.php
@@ -5,16 +5,16 @@
 use \Drupal\entity_reference_revisions\Plugin\Field\FieldType\EntityReferenceRevisionsItem as BaseEntityReferenceRevisionsItem;
 
 class EntityReferenceRevisionsItem extends BaseEntityReferenceRevisionsItem {
+
   /**
    * {@inheritdoc}
    */
   public function preSave() {
-
     if ($this->hasNewEntity()) {
       // As part of a bulk or replication operation there might be multiple
       // parent entities wanting to auto-create the same reference. So at this
-      // point this entity might already be saved, so we look it up by UUID and
-      // map it correctly.
+      // point this entity might already be saved, so look it up by UUID and map
+      // it correctly.
       // @see \Drupal\relaxed\BulkDocs\BulkDocs::save()
       if ($this->entity->isNew()) {
         $uuid = $this->entity->uuid();
@@ -25,7 +25,7 @@ public function preSave() {
           $entity_type_manager = \Drupal::service('entity_type.manager');
           $entity_type_id = $this->entity->getEntityTypeId();
 
-          // Now we have to decide what revision to use.
+          // Now decide what revision to use.
           $id_key = $entity_type_manager
             ->getDefinition($entity_type_id)
             ->getKey('id');
@@ -65,7 +65,6 @@ public function preSave() {
       $this->target_id = $this->entity->id();
       $this->target_revision_id = $this->entity->getRevisionId();
     }
-
   }
 
 }