diff --git a/LuaLibs/WMachiningLib.lua b/LuaLibs/WMachiningLib.lua
index d5a346c..ee4f15e 100644
--- a/LuaLibs/WMachiningLib.lua
+++ b/LuaLibs/WMachiningLib.lua
@@ -186,9 +186,11 @@ end
 ---------------------------------------------------------------------
 function WMachiningLib.AddMachining( Proc, sName, sMachining)
    local nMchId, sFinalName = EgtAddMachining( sName, sMachining)
-   local nPriority = EgtGetInfo( Proc.Id, 'PRIORITY', 'i')
-   EgtSetInfo( nMchId, 'PRIORITY', nPriority)
-   EgtSetInfo( nMchId, 'ISOUTLINE', Proc.IsOutline)
+   if type(Proc) == 'table' then
+      local nPriority = EgtGetInfo( Proc.Id or GDB_ID.NULL, 'PRIORITY', 'i')
+      EgtSetInfo( nMchId or GDB_ID.NULL, 'PRIORITY', nPriority)
+      EgtSetInfo( nMchId or GDB_ID.NULL, 'ISOUTLINE', Proc.IsOutline)
+   end
    return nMchId, sFinalName
 end