diff --git a/VERSION b/VERSION
index 89acc9519..59a550906 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-10.0.11
+10.0.12
diff --git a/sorc/ncep_post.fd/CALUPDHEL.f b/sorc/ncep_post.fd/CALUPDHEL.f
index 11fbc98b2..b9e3bbbec 100644
--- a/sorc/ncep_post.fd/CALUPDHEL.f
+++ b/sorc/ncep_post.fd/CALUPDHEL.f
@@ -11,6 +11,7 @@
 !!   11-01-11  M Pyle - converted to F90 for unified post
 !!   11-04-05  H Chuang - added B grid option
 !!   20-11-06  J Meng - USE UPP_MATH MODULE
+!!   22-03-17  Wen Meng - Restrict computation from undefined grids.
 !!     
 !! USAGE:    CALL CALUPDHEL(UPDHEL)
 !!
@@ -101,6 +102,8 @@ SUBROUTINE CALUPDHEL(UPDHEL)
       DO J=JSTA_M,JEND_M
         DO I=2,IM-1
 
+          IF (HTSFC(I,J) < spval) THEN
+
           R2DX   = 1./(2.*DX(I,J))
           R2DY   = 1./(2.*DY(I,J))
 
@@ -133,6 +136,11 @@ SUBROUTINE CALUPDHEL(UPDHEL)
 
             ENDIF
           ENDDO l_loop
+
+          ELSE
+            UPDHEL(I,J) = spval
+          ENDIF
+
         ENDDO
       ENDDO