diff --git a/link.module b/link.module
index f3e5a37..061b430 100644
--- a/link.module
+++ b/link.module
@@ -458,6 +458,19 @@ function _link_validate(&$item, $delta, $field, $entity, $instance, $langcode, &
  *   The entity containing this link.
  */
 function _link_sanitize(&$item, $delta, &$field, $instance, &$entity) {
+  // As this function can be called multiple times and the item is changed by
+  // reference we need to ensure that there's always the original data to
+  // process otherwise processed data are processed again which might leads to
+  // unexpected results.
+  if (!isset($item['_link_sanitize_raw'])) {
+    // Store copy of original data to use in case of a second call.
+    $item['_link_sanitize_raw'] = $item;
+  }
+  else {
+    // Restore original data to process.
+    $item = $item['_link_sanitize_raw'];
+  }
+
   // Don't try to process empty links.
   if (empty($item['url']) && empty($item['title'])) {
     return;