diff --git a/controllers/UploadMedia.php b/controllers/UploadMedia.php
index 1457131..194cb9e 100644
--- a/controllers/UploadMedia.php
+++ b/controllers/UploadMedia.php
@@ -42,8 +42,11 @@ class UploadMedia extends HTMLController
 				$new_ids[] = $asset->getId();
 				$asset->linkTags([$tag->id_tag]);
 
-				$tag->id_asset_thumb = $asset->getId();
-				$tag->save();
+				if (empty($tag->id_asset_thumb))
+				{
+					$tag->id_asset_thumb = $asset->getId();
+					$tag->save();
+				}
 			}
 
 			if (isset($_REQUEST['format']) && $_REQUEST['format'] === 'json')