IE crashes while onComplete of Request.JSON

[VuuRWerK]

Hi,

i have a big problem. IE (6/7) crashes while onComplete-Event of
Request.JSON. (FF2/3 and Opera works perfectly!). I have try to debug
with M$ Script Debugger.
The point where IE crashs is in constructor (initialize) of the class
'Class'. (Uncompressed mootools 1.2, Line: 1019, this is the line: var
self = (this.initialize) ? this.initialize.apply(this, arguments) :
this; )

The crash occurs when a class of mine will initialize. Here a part of
my class (constructor/initialize):

var TargossTab = new Class({
        Implements: Options,
        options: {
                // ...
        },
        initialize: function(parentPanel, options) {
                this.setOptions(options);
                this.options.args = $H(this.options.args);
                this.parentPanel = parentPanel;
                // ...
        },
// ...
});
And the part of instantiate the class (in my onComplete-function of
the Request.JSON instance):
tabPanel.addTab(new TargossTab(tabPanel, {
    // ... options ...
}));

I hope anybody can help me? Ask me if you need more informations, but
i hope i have nothing forget.

Greetings
Christian / VuuRWerK