diff --git a/LuaLibs/ProcessLapJoint.lua b/LuaLibs/ProcessLapJoint.lua
index 347b27d..e45ecbd 100644
--- a/LuaLibs/ProcessLapJoint.lua
+++ b/LuaLibs/ProcessLapJoint.lua
@@ -6026,6 +6026,9 @@ local function AddMillCornerMachining( nPartId, nNewProc, nFacInd, tFacAdj, nAdd
          nIdEndPoint = 5
          nIdIniPoint = 4
       end
+   else
+      local sErr = 'Error : Impossible insert clean corner from bottom'
+      return false, sErr
    end
    -- versore direzione
    local vtExtr = tFacAdj[nIdIniPoint] - tFacAdj[nIdEndPoint]
@@ -7690,7 +7693,7 @@ local function MakeMoreFaces( Proc, nPhase, nRawId, nPartId, dOvmHead, bSinglePa
                end
                local nBoreOnCorner = EgtGetInfo( Proc.Id, Q_BORE_ON_CORNER, 'i') or 0
                local nContourSmallTool = EgtGetInfo( Proc.Id, Q_CONTOUR_SMALL_TOOL, 'i') or 0
-               local nCleanCorner = EgtGetInfo( Proc.Id, Q_CLEAN_CORNER, 'i') or 1
+               local nCleanCorner = EgtGetInfo( Proc.Id, Q_CLEAN_CORNER, 'i') or 0
                -- se abilitato dal parametro Q inserisco foro sullo spigolo
                if nBoreOnCorner == 1 then
                   local bOk, sWarn2