Fatal Error on Form Submittion

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Hello!
I am hoping someone can help me with this issue. One one of my client's websites we are having the "Fatal error: Exception thrown without a stack frame in Unknown on line 0" page after they submit from forms that were created using the custom form block code. This has not been an issue for the last year but it all of the sudden started to throw out this error. Below is the controller code, maybe this will help with figuring out the issue.

<?php defined('C5_EXECUTE') or die(_("Access Denied."));
class UltimusSummitRSVPFormBlockController extends BlockController {
/*    ^^^^^^^^^^^^^^^^^
      Change this portion
      of the class name to
      correspond with the
      block's directory name
*/
   protected $btDescription = "Ultimus Summit RSVP Form";
   protected $btName = "Ultimus Summit RSVP Form";
   protected $btTable = 'btUltimusSummitRSVPForm'; //Change db.xml table name to match this
   protected $btInterfaceWidth = "500";
   protected $btInterfaceHeight = "450";
   protected $btCacheBlockRecord = true;
   protected $btCacheBlockOutput = true;

 
stortzdesign replied on at Permalink Reply
I forgot to mention that the form does submit and the sender gets a confirmation and the recipient get the form content. It just puts up white page with the error instead of redirecting.