diff --git a/LuaLibs/FaceData.lua b/LuaLibs/FaceData.lua
index bae8104..3fe713b 100644
--- a/LuaLibs/FaceData.lua
+++ b/LuaLibs/FaceData.lua
@@ -535,6 +535,7 @@ function FaceData.GetMainFaces( Proc, Part)
          Logs.WriteMainFacesLog( Proc, MainFaces)
       end
    else
+      MainFaces = nil
       EgtOutLog( '---MainFaces NOT NEEDED---')
    end
 
diff --git a/StrategyLibs/SLOTBYBLADE.lua b/StrategyLibs/SLOTBYBLADE.lua
index 0b1beb2..d49fb1c 100644
--- a/StrategyLibs/SLOTBYBLADE.lua
+++ b/StrategyLibs/SLOTBYBLADE.lua
@@ -145,7 +145,7 @@ function SLOTBYBLADE.Make( Proc, Part, FaceToMachine, EdgeToMachine, OptionalPar
       EgtOutLog( Cutting.sMessage)
       return Cutting, EdgeToMachine.dElevation
    end
-   if #( Proc.MainFaces) > 0 and #( Proc.MainFaces.SideFaces) > 1 then
+   if Proc.MainFaces and #( Proc.MainFaces.SideFaces) > 1 then
       -- se tasca più stretta della lama la strategia non è applicabile
       if TOOLS[Cutting.nToolIndex].dDiameter > EdgeToMachine.dLength + 10 * GEO.EPS_SMALL then
          Cutting.sMessage = 'Pocket too narrow for blade diameter'
diff --git a/StrategyLibs/SLOTBYCHAINSAW.lua b/StrategyLibs/SLOTBYCHAINSAW.lua
index dbf2bff..92608a5 100644
--- a/StrategyLibs/SLOTBYCHAINSAW.lua
+++ b/StrategyLibs/SLOTBYCHAINSAW.lua
@@ -124,7 +124,7 @@ function SLOTBYCHAINSAW.Make( Proc, Part, FaceToMachine, EdgeToMachine, Optional
       EgtOutLog( Mortising.sMessage)
       return Mortising
    end
-   if #( Proc.MainFaces) > 0 and #( Proc.MainFaces.SideFaces) > 1 then
+   if Proc.MainFaces and #( Proc.MainFaces.SideFaces) > 1 then
       -- se tasca più stretta della sega a catena la strategia non è applicabile
       if TOOLS[Mortising.nToolIndex].dWidth > EdgeToMachine.dLength + 10 * GEO.EPS_SMALL then
          Mortising.sMessage = 'Pocket too narrow for chainsaw width'