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-rw-r--r--src/aig/gia/giaTim.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/aig/gia/giaTim.c b/src/aig/gia/giaTim.c
index 71b9a475..29aa93f8 100644
--- a/src/aig/gia/giaTim.c
+++ b/src/aig/gia/giaTim.c
@@ -584,6 +584,8 @@ int Gia_ManLutLevelWithBoxes( Gia_Man_t * p )
Gia_Obj_t * pObj, * pObjIn;
int i, k, j, curCi, curCo, LevelMax;
assert( Gia_ManRegNum(p) == 0 );
+ if ( pManTime == NULL )
+ return Gia_ManLutLevel(p, NULL);
// copy const and real PIs
Gia_ManCleanLevels( p, Gia_ManObjNum(p) );
Gia_ObjSetLevel( p, Gia_ManConst0(p), 0 );