diff --git a/jquery.tablesorter.js b/jquery.tablesorter.js
index c5eabf0..a9c2f81 100644
--- a/jquery.tablesorter.js
+++ b/jquery.tablesorter.js
@@ -865,7 +865,7 @@
                 return /^[-+]?\d*$/.test($.trim(s.replace(/[,.']/g, '')));
             };
             this.clearTableBody = function (table) {
-                if ($.browser.msie) {
+                if ($.browser && $.browser.msie) {
                     while (table.tBodies[0].firstChild) {
                         table.tBodies[0].removeChild(table.tBodies[0].firstChild);
                     }