diff --git a/pixelegg/inc/class.pixelegg_framework.inc.php b/pixelegg/inc/class.pixelegg_framework.inc.php
index ed7f53a73d..ab7f1571a0 100755
--- a/pixelegg/inc/class.pixelegg_framework.inc.php
+++ b/pixelegg/inc/class.pixelegg_framework.inc.php
@@ -121,7 +121,7 @@ class pixelegg_framework extends Api\Framework\Ajax
 			}
 		";
 		$textsize = $GLOBALS['egw_info']['user']['preferences']['common']['textsize'];
-		if (!empty($textsize) && $textsize != '12')
+		if (!empty($textsize) && is_numeric($textsize) && $textsize != '12')
 		{
 			$iconSize = $textsize+4;
 			$ret['app_css'] .= "
@@ -235,4 +235,4 @@ body #egw_fw_sidebar #egw_fw_sidemenu .egw_fw_ui_category_active{background-colo
 
 		return parent::login_screen($extra_vars, $change_passwd);
 	}
-}
+}
\ No newline at end of file