Merge pull request #12153 from piwik/logactionprimarykeyfix

Log action primary needs to return an array, not a string

plugins/CoreHome/Tracker/LogTable/Action.php

@@ -34,6 +34,6 @@ class Action extends LogTable
 
     public function getPrimaryKey()
     {
-        return 'idaction';
+        return array('idaction');
     }
 }