diff --git a/lv/lv0400.cpp b/lv/lv0400.cpp
index 0b9513ffc..50617dea2 100755
--- a/lv/lv0400.cpp
+++ b/lv/lv0400.cpp
@@ -384,7 +384,7 @@ bool TContratti_msk::on_field_event(TOperable_field& o,TField_event e,long jolly
       {
         TToken_string& riga = ss.row(sel);
         riga.add(o.get(), ss.cid2index(F_CALCCONS));
-        if (field(F_PPCONF).empty())
+        if (riga.get_long(ss.cid2index(S_PPCONF)) <= 0)
           ss.disable_cell(sel, ss.cid2index(S_CONG));
         else
         {