diff --git a/src/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php b/src/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php
index 06fc964e7..3f1a6b1a5 100644
--- a/src/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php
+++ b/src/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php
@@ -126,6 +126,14 @@ class REST_Metadatum_Mappers_Controller extends REST_Controller {
 	            $response = [];
 	            $saved = [];
     	        foreach ($body['metadata_mappers'] as $metadatum_mapper) {
+    	            $metadatum_mapper['metadatum_id'] = intval($metadatum_mapper['metadatum_id']);
+    	            if(is_array($metadatum_mapper['mapper_metadata'])) {
+	                    foreach ($metadatum_mapper['mapper_metadata'] as $k => $tag) {
+	                        $metadatum_mapper['mapper_metadata'][$k] = esc_attr($tag);
+	                    }
+    	            } else {
+    	                $metadatum_mapper['mapper_metadata'] = sanitize_text_field($metadatum_mapper['mapper_metadata']);
+    	            }
     	            $isSaved = false;
     	            $metadatum = $Tainacan_Metadata->fetch($metadatum_mapper['metadatum_id']);
     	            $exposer_mapping = $metadatum->get('exposer_mapping');
diff --git a/tests/test-api-metadatum-mappers.php b/tests/test-api-metadatum-mappers.php
index 576e56d0f..00fd3e5b4 100644
--- a/tests/test-api-metadatum-mappers.php
+++ b/tests/test-api-metadatum-mappers.php
@@ -16,7 +16,7 @@ class TAINACAN_REST_Metadatum_Mappers_Controller extends TAINACAN_UnitApiTestCas
             ),
             true,
             true
-            );
+        );
         
         $type = $this->tainacan_metadatum_factory->create_metadatum('text');
         
@@ -33,7 +33,7 @@ class TAINACAN_REST_Metadatum_Mappers_Controller extends TAINACAN_UnitApiTestCas
             ),
             true,
             true
-            );
+        );
         
         $metadatum2 = $this->tainacan_entity_factory->create_entity(
             'metadatum',
@@ -45,7 +45,7 @@ class TAINACAN_REST_Metadatum_Mappers_Controller extends TAINACAN_UnitApiTestCas
             ),
             true,
             true
-            );
+        );
         
         $item = $this->tainacan_entity_factory->create_entity(
             'item',
@@ -56,7 +56,7 @@ class TAINACAN_REST_Metadatum_Mappers_Controller extends TAINACAN_UnitApiTestCas
             ),
             true,
             true
-            );
+        );
         $this->collection = $collection;
         $this->item = $item;
         $this->metadatum = $metadatum;
@@ -126,6 +126,38 @@ class TAINACAN_REST_Metadatum_Mappers_Controller extends TAINACAN_UnitApiTestCas
 	    
 	}
 	
+	/**
+	 * @group new_mapper_metadatum
+	 */
+	public function test_update_metadatum_mappers_new_meta(){
+	    extract($this->create_meta_requirements());
+	    
+	    $dc = new \Tainacan\Exposers\Mappers\Dublin_Core();
+	    
+	    $metadatum_mapper_request = new \WP_REST_Request('POST', $this->namespace . '/metadatum-mappers');
+	    $new_metadatum_mapper = new \stdClass();
+	    $new_metadatum_mapper->slug = 'TesteNewMeta';
+	    $new_metadatum_mapper->uri = 'TesteNewMetaUri.com';
+	    $new_metadatum_mapper->type = 'text';
+	    $metadatum_mapper_json = json_encode([
+	        'metadata_mappers'       => [
+	            ['metadatum_id' => $metadatum->get_id(), 'mapper_metadata' => 'contributor'],
+	            ['metadatum_id' => $metadatum2->get_id(), 'mapper_metadata' => $new_metadatum_mapper ]
+	        ],
+	        'exposer_map'          => $dc->slug
+	    ]);
+	    $metadatum_mapper_request->set_body($metadatum_mapper_json);
+	    $metadatum_mapper_response = $this->server->dispatch($metadatum_mapper_request);
+	    $this->assertEquals(200, $metadatum_mapper_response->get_status());
+	    $data = $metadatum_mapper_response->get_data();
+	    
+	    $this->assertEquals('contributor', $data[0]['exposer_mapping']['dublin-core']);
+	    $this->assertEquals('TesteNewMeta', $data[1]['exposer_mapping']['dublin-core']['slug']);
+	    $this->assertEquals('TesteNewMetaUri.com', $data[1]['exposer_mapping']['dublin-core']['uri']);
+	    $this->assertEquals('text', $data[1]['exposer_mapping']['dublin-core']['type']);
+	    
+	}
+	
 }
 
 ?>
\ No newline at end of file