webbrowser crash when opening website

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C++/CLI

Good afternoon,

I'm building an autopatcher for a game.
The programs works like this.
The main form (Form1) updates and when it's over calls Form2 (whcic is the menu with buttons and such)
In form 2 i've created the shown event that displays a website

private: System::Void shown1(System::Object^  sender, System::EventArgs^  e)
         {
             String^ aux2=gcnew String(d->registo);
             this->webBrowser1->Navigate(aux2);
         }

with d->registo = "www.metin2.pt"

If the website is metin2.pt i get this error when loading the website

An unhandled exception of type 'System.AccessViolationException' occurred in System.Windows.Forms.dll

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

BUT if the website is google.pt the webbrower load's it normally.

How can i fix this?