PROC CAUSALMED terminates abnormally if you specify a CLASS variable with a large number of levels in the COVAR statement. The following messages occur in the log:

ERROR:  An exception has been encountered.
Please contact technical support and provide them with the  
following traceback information:

The SAS task name is [CAUSALME]
Segmentation Violation

Workaround

You can circumvent this issue by reducing the number of covariate levels.