diff --git a/abclib.dsp b/abclib.dsp
index 7129d0e87..e1fbe7f31 100644
--- a/abclib.dsp
+++ b/abclib.dsp
@@ -267,6 +267,10 @@ SOURCE=.\src\base\abci\abcDsd.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\src\base\abci\abcExact.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\src\base\abci\abcExtract.c
 # End Source File
 # Begin Source File
diff --git a/src/aig/gia/giaSatLE.c b/src/aig/gia/giaSatLE.c
index ec243423c..63a451795 100644
--- a/src/aig/gia/giaSatLE.c
+++ b/src/aig/gia/giaSatLE.c
@@ -605,6 +605,8 @@ void Sle_ManDeriveInit( Sle_Man_t * p )
         assert( Gia_ObjIsAnd(Gia_ManObj(p->pGia, iObj)) );
         // find edge
         iEdge = Vec_IntFind( Vec_WecEntry(p->vCutFanins, iObj), iFanin );
+        if ( iEdge < 0 )
+            continue;
         assert( iEdge >= 0 );
         Vec_IntPush( p->vPolars, Vec_IntEntry(p->vEdgeFirst, iObj) + iEdge ); // edge
     }