bug fix for pme.c MPI_COMM_NULL fix dcf8b67e

Change-Id: Idb233db1337bcb881041caec96572e5df6183e6e

diff --git a/src/mdlib/pme.c b/src/mdlib/pme.c
index 735c0e878ae5f68e226540f6712e8a854155f178..2f5ce0a84bdb02f730a76a55205029b73fd9a8a3 100644 (file)
--- a/src/mdlib/pme.c
+++ b/src/mdlib/pme.c
@@ -2076,6 +2076,10 @@ int gmx_pme_init(gmx_pme_t *         pmedata,
 
     if (pme->nnodes == 1)
     {
+#ifdef GMX_MPI
+        pme->mpi_comm_d[0] = MPI_COMM_NULL;
+        pme->mpi_comm_d[1] = MPI_COMM_NULL;
+#endif
         pme->ndecompdim = 0;
         pme->nodeid_major = 0;
         pme->nodeid_minor = 0;