After a number of boolean operations nearing the final shape of my polysolid the software refuses to perform further boolean operations with 'null solid created, deleted' appearing on my command line.

Im assuming the object has lost a certain amount of precision and the software -not being sure in a way of speaking- discards the operation all together. there are nurb splines involved so that might be part of the precision issue.

Is there anything like the 'brep' command that could refresh the object in a way so that i can finally union all the bits together?