diff --git a/plugins/MultiSites/API.php b/plugins/MultiSites/API.php
index 08055385bfc5b60f69d00d6e2fa13b762b9f14dc..e7d0093a275c6deb6206bc3043cce6fdf10d7392 100755
--- a/plugins/MultiSites/API.php
+++ b/plugins/MultiSites/API.php
@@ -91,6 +91,10 @@ class API extends \Piwik\Plugin\API
 
         $sites = $this->getSitesIdFromPattern($pattern, $_restrictSitesToLogin);
 
+        if (!empty($showColumns) && !is_array($showColumns)) {
+            $showColumns = explode(',', $showColumns);
+        }
+
         if (empty($sites)) {
             return new DataTable();
         }