ajax - Javascript error on sharepoint page with search webpart and User Control containing UpdatePanel -

I have been trying to find the cause of this error for some time ...

Close is a SharePoint 2007 site that has been heavily adapted in terms of its eyes and feeling.

A user control has been inserted into the master page, which uses part of the control panel to present updates in the control.

User controls work fine on all pages until a search is entered into the Web Part page.

There is a dropdown list in control that hides according to the user's choice or shows a different panel. There are also buttons that cause async postbacks within each panel.

When a "search core result" webpage is inserted into a page, a javascript error occurs from all async requests and there is no update in the update panel.

The javascipt error is:

Sys.WebForms.PageRequestManagerServerErrorException: The object reference is not set to an instance of an object.

The problem is that I can not even understand what this object is. It seems that the script manager (though its in the master page)

Is there a way to get a detailed description of this error? Also, are there any known conflicts or problems with the Update panel and SharePoint Search Web Parts?

I am relatively new to SharePoint development and are still trying to find my way around optimization and debugging.

In the request, the only difference is that without search webpage it contains an NTLM authorization header, while the request on the page with Webbut is not an authorization header.

In response, whatever works, there is a private cache-control with some cookies set (I guess for authentication), while other no-cache nor cookies set apart, the reaction The text has updated controls, while it works, while the other page gives it:

53 | Error | 500 Object references are not set to an instance of an object.

Can the Authority have a problem here?

Whether you are using visible assets to hide the dropdown list control or not, if not Please