diff --git a/LuaLibs/ProcessLapJoint.lua b/LuaLibs/ProcessLapJoint.lua
index 3614d79..856b3e8 100644
--- a/LuaLibs/ProcessLapJoint.lua
+++ b/LuaLibs/ProcessLapJoint.lua
@@ -3466,9 +3466,13 @@ local function MakeByPockets( Proc, nPhase, nRawId, nPartId, nChamfer, dDepthCha
          if ( ( nChosenToolUuid == nToolId) and bIsToolActive) then break end
          sToolName = EgtTdbGetNextTool( MCH_TF.MILL)
       end
-      local dChosenToolDiameter = EgtTdbGetCurrToolParam( MCH_TP.DIAM)
-      dMinFaceElevForPocket = dChosenToolDiameter / 2 + 10 * GEO.EPS_SMALL
-      sChosenToolUuid = EgtTdbGetCurrToolParam( MCH_TP.UUID)
+      if sToolName == '' then
+         sChosenToolUuid = ''
+      else
+         local dChosenToolDiameter = EgtTdbGetCurrToolParam( MCH_TP.DIAM)
+         dMinFaceElevForPocket = dChosenToolDiameter / 2 + 10 * GEO.EPS_SMALL
+         sChosenToolUuid = EgtTdbGetCurrToolParam( MCH_TP.UUID)
+      end
    end
    
    if sMchFindMaster and #sMchFindMaster > 0 then
@@ -3944,7 +3948,7 @@ local function MakeByPockets( Proc, nPhase, nRawId, nPartId, nChamfer, dDepthCha
          end
       end
    end
-   if sChosenToolUuid then
+   if sChosenToolUuid  == '' then
       local sErr = 'Error : no machining found with chosen Tool_ID'
       EgtOutLog( sErr)
       return -1, sErr