offset: make sure there is a parent node to work on while calculating scroll offsets...

diff --git a/src/offset.js b/src/offset.js
index cf1af33..8ee5680 100644 (file)
--- a/src/offset.js
+++ b/src/offset.js
@@ -55,7 +55,7 @@ jQuery.fn.offset = function() {
                        }
                
                        // Get parent scroll offsets
-                       while ( parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
+                       while ( parent && parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
                                // Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug
                                if ( !/^inline|table.*$/i.test(jQuery.css(parent, "display")) )
                                        // Subtract parent scroll offsets