jQuery Grid Plugin - jqGrid

Hi, I've a problem with the new version of jqgrid (in preceding versions it was ok). When I try to hide many columns via "hideCol", method, this error is thrown. It seems that depends of the number of hidden columns. For example, in a table of 22 columns, the error appears when there are more than 7 hidden columns. Any idea? Thanks.

1. Uncaught TypeError: Cannot read property 'width' of undefined
   1. b.jgrid.extend.setGridWidthjquery.jqGrid.min.js:141
   2. d.d.extend.eachjquery-1.5.2.min.js:16
   3. d.d.fn.d.eachjquery-1.5.2.min.js:16
   4. b.jgrid.extend.setGridWidthjquery.jqGrid.min.js:138
   5. b.fn.jqGridjquery.jqGrid.min.js:28
   6. b.jgrid.extend.showHideColjquery.jqGrid.min.js:136
   7. d.d.extend.eachjquery-1.5.2.min.js:16
   8. d.d.fn.d.eachjquery-1.5.2.min.js:16
   9. b.jgrid.extend.showHideColjquery.jqGrid.min.js:135
   10. b.fn.jqGridjquery.jqGrid.min.js:28
   11. b.jgrid.extend.hideColjquery.jqGrid.min.js:136
   12. d.d.extend.eachjquery-1.5.2.min.js:16
   13. d.d.fn.d.eachjquery-1.5.2.min.js:16
   14. b.jgrid.extend.hideColjquery.jqGrid.min.js:136
   15. b.fn.jqGridjquery.jqGrid.min.js:28
   16. hidePaxTableColumns