Index: branches/5.2.x/core/units/helpers/list_helper.php
===================================================================
diff -u -N -r14244 -r14628
--- branches/5.2.x/core/units/helpers/list_helper.php	(.../list_helper.php)	(revision 14244)
+++ branches/5.2.x/core/units/helpers/list_helper.php	(.../list_helper.php)	(revision 14628)
@@ -88,7 +88,7 @@
 
 			if ($config_mapping) {
 				if (!array_key_exists('PerPage', $config_mapping)) {
-					trigger_error('Incorrect mapping of <span class="debug_error">PerPage</span> key in config for prefix <strong>' . $event->Prefix . '</strong>', E_USER_WARNING);
+					trigger_error('Incorrect mapping of <span class="debug_error">PerPage</span> key in config for prefix <strong>' . $prefix . '</strong>', E_USER_WARNING);
 				}
 
 				$per_page = $this->Application->ConfigValue($config_mapping['PerPage']);