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-rw-r--r--src/base/acb/acbMfs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/base/acb/acbMfs.c b/src/base/acb/acbMfs.c
index 9a1ff847..7b86a686 100644
--- a/src/base/acb/acbMfs.c
+++ b/src/base/acb/acbMfs.c
@@ -95,7 +95,7 @@ Vec_Wec_t * Acb_DeriveCnfForWindow( Acb_Ntk_t * p, Vec_Int_t * vWin, int PivotVa
if ( Abc_LitIsCompl(iObj) && i < PivotVar )
continue;
vCnfBase = (Vec_Str_t *)Vec_WecEntry( vCnfs, iObj );
- if ( vCnfBase != NULL )
+ if ( Vec_StrSize(vCnfBase) > 0 )
continue;
if ( vCnf == NULL )
vCnf = Vec_StrAlloc( 1000 );