Baseline comparison fails during comparison in ALM?

Hi, We are find the following issue when attempting,to compare baselines to libraries within our ALM application. When we are attempting to compare a library to a baseline, the task fails.An error occurs stating that: "Violation of PRIMARY KEY constraint 'HIST_CROS_REF_PK'. Cannot insert duplicate key in object 'dbo.HIST_CROS_REF'. The duplicate key value is (53, 2)." The comparison fails and we can't find out a way to perform this action. Is this a known issue and is there a workaround or some solution? Thanks, HomerJ