diff --git a/src/aig/gia/giaDup.c b/src/aig/gia/giaDup.c
index e64ba002b..258687fe6 100644
--- a/src/aig/gia/giaDup.c
+++ b/src/aig/gia/giaDup.c
@@ -1685,6 +1685,7 @@ Gia_Man_t * Gia_ManDupAbsGates( Gia_Man_t * p, Vec_Int_t * vGateClasses )
             pCopy = Gia_ObjCopy( pTemp, pObj );
             if ( !~pCopy->Value )
             {
+                Vec_IntWriteEntry( vGateClasses, i, 0 );
                 pObj->Value = ~0;
                 continue;
             }
diff --git a/src/aig/saig/saigGlaCba.c b/src/aig/saig/saigGlaCba.c
index a2c434c5f..d5a94acb0 100644
--- a/src/aig/saig/saigGlaCba.c
+++ b/src/aig/saig/saigGlaCba.c
@@ -280,6 +280,8 @@ Aig_Man_t * Aig_Gla1DeriveAbs( Aig_Gla1Man_t * p )
     Aig_ManSetRegNum( pNew, Vec_IntSize(p->vFlops) );
     // clean up
     RetValue = Aig_ManCleanup( pNew );
+    if ( RetValue > 0 )
+        printf( "Aig_Gla1DeriveAbs(): Internal error! Object count mismatch.\n" );
     assert( RetValue == 0 );
     return pNew;
 }