Unhandled exception in irms vs ams 13c plot

[blongworth]

Exception on hover. This was on a run where client samples were skipped. May be an indexing issue.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at SNICSer.frmC13compare.zc1_MouseMoveEvent(ZedGraphControl sender, MouseEventArgs e) in D:\Users\Brett\Documents\Projects\SNICSer\SNICSer\SNICSr\frmC13compare.vb:line 14
at ZedGraph.ZedGraphControl.ZedGraphControl_MouseMove(Object sender, MouseEventArgs e)
at System.Windows.Forms.Control.OnMouseMove(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseMove(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.UserControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)