Excel crashing with add-in

Hi , trying to investigate the following issue with an excel add-in.  Any insight?

Thanks!

Problem signature:

  Problem Event Name:                        BEX

  Application Name:                             EXCEL.EXE

  Application Version:                           14.0.7135.5000

  Application Timestamp:                     542ecc22

  Fault Module Name:                          StackHash_0a9e

  Fault Module Version:                        0.0.0.0

  Fault Module Timestamp:                  00000000

  Exception Offset:                                0040b8ac

  Exception Code:                                  80000003

  Exception Data:                                   badc0de1

  OS Version:                                          6.1.7601.2.1.0.256.48

  Locale ID:                                             1033

  Additional Information 1:                  0a9e

  Additional Information 2:                  0a9e372d3b4ad19135b953a78882e789

  Additional Information 3:                  0a9e

  Additional Information 4:                  0a9e372d3b4ad19135b953a78882e789