From 3e5e7a254426bac5b5f9634ff5f087faf275c2c1 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Wed, 29 Feb 2012 10:51:05 -0800
Subject: Added skipping &iso when there is only one PO.

---
 src/base/abci/abc.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/base/abci/abc.c')

diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 0eabe4c7..c8090460 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -27966,6 +27966,11 @@ int Abc_CommandAbc9Iso( Abc_Frame_t * pAbc, int argc, char ** argv )
         return 1;
     }
     pAig = Gia_ManIsoReduce( pAbc->pGia, &vPosEquivs, fVerbose );
+    if ( pAig == NULL )
+    {
+        Abc_Print( -1, "Abc_CommandAbc9Iso(): Transformation has failed.\n" );
+        return 1;
+    }
     // update the internal storage of PO equivalences
     Abc_FrameReplacePoEquivs( pAbc, &vPosEquivs );
     // update the AIG
-- 
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