diff -u b/restws.formats.inc b/restws.formats.inc
--- b/restws.formats.inc
+++ b/restws.formats.inc
@@ -275,6 +275,9 @@
             else {
               $list_type = entity_property_list_extract_type($info['type']);
               foreach ($property_value as &$list_value) {
+                if (!(is_array($list_value))) {
+                  continue;
+                }
                 $list_value = $this->getResourceReferenceValue($list_type, $list_value);
               }
             }
@@ -285,6 +288,9 @@
               $this->getPropertyValues($property_value, $info['property info']);
             }
             else {
+              if (!(is_array($property_value))) {
+                continue;
+              }
               $property_value = $this->getResourceReferenceValue($info['type'], $property_value);
             }
           }
@@ -331,10 +337,6 @@
       }
       return reset($ids);
     }
-    else
-    {
-      return $reference;
-    }
 
     throw new RestWSException('Invalid value for resource reference given.', 406);
   }
diff -u b/restws.test b/restws.test
--- b/restws.test
+++ b/restws.test
@@ -16,32 +16,58 @@
   }
 
   public function setUp() {
-    parent::setUp('restws', 'entity', 'entity_test', 'locale');
+    parent::setUp('restws');
 
-    // Create a field having 4 values for testing multiple value support.
-    $this->field_name = drupal_strtolower($this->randomName() . '_field_name');
-    $this->field = array('field_name' => $this->field_name, 'type' => 'text', 'cardinality' => 4);
-    $this->field = field_create_field($this->field);
-    $this->field_id = $this->field['id'];
-    $this->instance = array(
-      'field_name' => $this->field_name,
+    // Create a text field having 2 values, and a list_text field having
+    // unlimited values for testing multiple value support.
+    field_create_field(array(
+      'field_name' => 'field_text_test',
+      'type' => 'text',
+      'cardinality' => 2,
+    ));
+    field_create_instance(array(
+      'field_name' => 'field_text_test',
       'entity_type' => 'node',
       'bundle' => 'page',
-      'label' => $this->randomName() . '_label',
-      'description' => $this->randomName() . '_description',
-      'weight' => mt_rand(0, 127),
+      'label' => 'Test text field',
+      'description' => '',
+      'weight' => 0,
       'settings' => array(
         'text_processing' => FALSE,
       ),
       'widget' => array(
         'type' => 'text_textfield',
-        'label' => 'Test Field',
+        'label' => 'Test text field',
         'settings' => array(
           'size' => 64,
         )
       )
-    );
-    field_create_instance($this->instance);
+    ));
+    field_create_field(array(
+      'field_name' => 'field_list_text_test',
+      'type' => 'list_text',
+      'cardinality' => -1,
+      'settings' => array(
+        'allowed_values' => array(
+          'test1' => 'Test 1',
+          'test2' => 'Test 2',
+        ),
+      ),
+    ));
+    field_create_instance(array(
+      'field_name' => 'field_list_text_test',
+      'entity_type' => 'node',
+      'bundle' => 'page',
+      'label' => 'Test list text field',
+      'description' => '',
+      'weight' => 0,
+      'settings' => array(),
+      'widget' => array(
+        'module' => 'options',
+        'settings' => array(),
+        'type' => 'options_buttons',
+      )
+    ));
   }
 
   /**
@@ -78,22 +104,26 @@
     $this->assertResponse('201', 'HTTP response code is correct.');
     $this->assertEqual(curl_getinfo($this->curlHandle, CURLINFO_CONTENT_TYPE), 'application/json', 'HTTP content type is correct.');
 
-    // Test Create node with multi value field.
-    $multivaluefield = array(array('value' => $this->randomName(8),), array('value' => $this->randomName(8),), array('value' => $this->randomName(8),), array('value' => $this->randomName(8),));
+    // Test Create node with multi value fields.
+    $field_text_test_values = array('test1', 'test2');
+    $field_list_text_test_values = array('test1', 'test2');
     $new_node = array(
       'body'      => array(LANGUAGE_NONE => array(array())),
       'title'     => $title,
       'type'      => 'page',
       'author'    => $account->uid,
-      $this->field_name => $multivaluefield,
+      'field_text_test' => $field_text_test_values,
+      'field_list_text_test' => $field_list_text_test_values,
     );
     $json = drupal_json_encode($new_node);
     $result = $this->httpRequest('node', 'POST', $account, $json);
     $result_array = drupal_json_decode($result);
     $nid = $result_array['id'];
     $node2 = node_load($nid);
-    $this->assertEqual($multivaluefield[0]['value'], $node2->{$this->field_name}['und'][0]['value'], 'Multi-value field from DB is equal to the new multi-value field. Value 1.');
-    $this->assertEqual($multivaluefield[1]['value'], $node2->{$this->field_name}['und'][1]['value'], 'Multi-value field from DB is equal to the new multi-value field. Value 2.');
+    $this->assertEqual($field_text_test_values[0], $node2->field_text_test['und'][0]['value'], 'Multi-value text field from DB is equal to the posted JSON value. Value 1.');
+    $this->assertEqual($field_text_test_values[1], $node2->field_text_test['und'][1]['value'], 'Multi-value text field from DB is equal to the posted JSON value. Value 2.');
+    $this->assertEqual($field_list_text_test_values[0], $node2->field_list_text_test['und'][0]['value'], 'Multi-value list_text field from DB is equal to the posted JSON value. Value 1.');
+    $this->assertEqual($field_list_text_test_values[1], $node2->field_list_text_test['und'][1]['value'], 'Multi-value list_text field from DB is equal to the posted JSON value. Value 2.');
     $this->assertResponse('201', 'HTTP response code is correct.');
     $this->assertEqual(curl_getinfo($this->curlHandle, CURLINFO_CONTENT_TYPE), 'application/json', 'HTTP content type is correct.');