GUID error - InvalidCastException: Unable to cast object of type 'System.Decimal' to type 'System.Int64'.

hi guys,
I am using GUID identifiers to track certain activities in cookies and checking to see if it exists in the db, but I am getting the error

InvalidCastException: Unable to cast object of type 'System.Decimal' to type 'System.Int64'.

Here is my code

string Cookies2 = Request.Cookies["Upload_Guid"].ToString();

Guid Cookie_Guid = Guid.Parse(Cookies2);// GEt the value of cookie and parse it to a GUID


var GID_Variable = await _context.Upload_Transaction
.SingleOrDefaultAsync(m => m.Cookie_GUID == Cookie_Guid);