diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 31628a367..e509f00f0 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -39133,6 +39133,11 @@ int Abc_CommandAbc9Cec( Abc_Frame_t * pAbc, int argc, char ** argv )
             goto usage;
         }
     }
+    if ( pAbc->pGia && pAbc->pGia->nXors )
+    {
+        Abc_Print( 0, "It looks like the current AIG is derived by &st -m.  Such AIG contains XOR gates and cannot be verified before &st is applied.\n" );
+        return 1;
+    }
     pArgvNew = argv + globalUtilOptind;
     nArgcNew = argc - globalUtilOptind;
     if ( fMiter )