--- MUMPS_4.9/src/dmumps_part2.F	2009-07-29 12:38:27.000000000 +0200
+++ MUMPS/src/dmumps_part2.F	2010-04-03 14:01:57.441212067 +0200
@@ -4618,6 +4618,9 @@
       INTEGER, INTENT(OUT) ::  PERM( N )
       INTEGER  :: IPERM, INODE, IN, I
       INTEGER  :: INBLEAF, INBROOT
+      IF (N.EQ.1) THEN
+         RETURN
+      END IF
       IF (N.GT.1) THEN
          IF(POOL(N-1) .LT. 0) THEN
             INBLEAF = N-1