diff --git a/preferences/inc/class.preferences_settings.inc.php b/preferences/inc/class.preferences_settings.inc.php
index 123b993cd5..c0a335fc53 100644
--- a/preferences/inc/class.preferences_settings.inc.php
+++ b/preferences/inc/class.preferences_settings.inc.php
@@ -218,7 +218,7 @@ class preferences_settings
 					break;
 			}
 
-			if (isset($value) && $value !== '' && $value !== '**NULL**')
+			if (isset($value) && $value !== '' && $value !== '**NULL**' && $value !== array())
 			{
 				if (is_array($value)) $value = implode(',',$value);	// multiselect