X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3d03a9262aa220f6853ef6e803e4d5a393d94296..260f6acdb4f0d33a1cd039cdf02124ebd9aa54cd:/src/smpi/smpi_mpi_dt.c

diff --git a/src/smpi/smpi_mpi_dt.c b/src/smpi/smpi_mpi_dt.c
index bc03ee9f5e..0db4d81a21 100644
--- a/src/smpi/smpi_mpi_dt.c
+++ b/src/smpi/smpi_mpi_dt.c
@@ -1460,7 +1460,7 @@ MPI_Op smpi_op_new(MPI_User_function * function, int commute)
 
 int smpi_op_is_commute(MPI_Op op)
 {
-  return op-> is_commute;
+  return (op==MPI_OP_NULL) ? 1 : op-> is_commute;
 }
 
 void smpi_op_destroy(MPI_Op op)