Error when right clicking on opened HTTP session

Hi,
this is the exception that I get when I right click on an external (Firefox) opened HTTP session.
It does not cause the program to crash, simply gives this panicking message :)

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Standard Edition 5.9.0.0

NullReferenceException - Riferimento a un oggetto non impostato su un'istanza di oggetto.

in Devolutions.RemoteDesktopManager.Managers.ConnectionManager.CanCloseConnection(Connection[] currentConnections)
in Devolutions.RemoteDesktopManager.Managers.SessionMenuManager.SetControlStates()
in Devolutions.RemoteDesktopManager.Frames.ConnectionViews.FreConnectionListView.ContextMenuStripOnOpening(Object sender, CancelEventArgs cancelEventArgs)
in System.Windows.Forms.ToolStripDropDown.OnOpening(CancelEventArgs e)
in System.Windows.Forms.ToolStripDropDown.SetVisibleCore(Boolean visible)
in System.Windows.Forms.ContextMenuStrip.SetVisibleCore(Boolean visible)
in System.Windows.Forms.ToolStripDropDown.Show(Control control, Point position)
in System.Windows.Forms.ContextMenuStrip.ShowInternal(Control source, Point location, Boolean isKeyboardActivated)
in System.Windows.Forms.Control.WmContextMenu(Message& m, Control sourceControl)
in System.Windows.Forms.Control.WmContextMenu(Message& m)
in System.Windows.Forms.Control.WndProc(Message& m)
in System.Windows.Forms.ListView.WndProc(Message& m)
in System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
in System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
in System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)