[jQuery] blockUI - Cannot convert undefined or null to Object

[jQuery] blockUI - Cannot convert undefined or null to Object


Hi,
I'm using jQuery 1.26 and blockui 2.10. Occured on Opera 9.61.
Problem listed below. My function in javascript:
function doRegister()
{
    try
    {
        $.blockUI(
        {
            overlayCSS :
            {
                opacity : '0.5',
                filter : 'alpha(opacity=50)'
            },
            message: $('#ajaxIndicator'),
            css:
            {
                'border' : '1px solid #fff',
                'font-family' : 'Tahoma',
                'font-size' : '11px',
                'font-weight' : 'bolder',
                color : '#e0e0e0',
                height : '120px',
                width: '380px',
                'background-color': '#303030'
            }
        });
        $.ajax(
        {
            type: "POST",
            url: "./action/doRegister.php",
            data:
            {
                email: ...
                pwd: .....
            },
            success: function(data)
            {
             ..................
            }
        });
        $.unblockUI();
    }
    catch(e)
{
$.unblockUI();
alert(e);
}
}
After few calls of this function (completed with success) I receive
the following error each time I call doRegister():
<localhost>
[Error:
name: TypeError
message: Statement on line 133: Cannot convert undefined or null to
Object
Backtrace:
Line 133 of linked script http://localhost/wepps/www2b/jquery/jquery.blockui.js:
In function install
data.parent = node.parentNode;
Line 23 of linked script http://localhost/wepps/www2b/jquery/jquery.blockui.js
function(opts) { install(window, opts); }
Line 6 of linked script http://localhost/wepps/www2b/js/register.js:
In function doRegister
        $.blockUI(
Line 1 of function script
doRegister();
...
]
What can I do with this? Is this Opera bug or blockUI?
Thanks a lot in advance,
Best regards