diff --git a/administrator/components/com_fields/helpers/fields.php b/administrator/components/com_fields/helpers/fields.php
index 9416817029119..18c41198c064f 100644
--- a/administrator/components/com_fields/helpers/fields.php
+++ b/administrator/components/com_fields/helpers/fields.php
@@ -291,6 +291,12 @@ public static function prepareForm($context, JForm $form, $data)
 
 		$component = $parts[0];
 		$section   = $parts[1];
+		
+		// Sanitize catids one item can be associated to only one category id
+		if (is_array($data->catid))
+		{
+			$data->catid = $data->catid[0];
+		}
 
 		$assignedCatids = isset($data->catid) ? $data->catid : (isset($data->fieldscatid) ? $data->fieldscatid : $form->getValue('catid'));