diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 878a4d5..2073082 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/MachMgrMachGroups.cpp b/MachMgrMachGroups.cpp
index 13362eb..217076a 100644
--- a/MachMgrMachGroups.cpp
+++ b/MachMgrMachGroups.cpp
@@ -371,7 +371,10 @@ MachMgr::PrepareCurrMachGroup( int nId)
    m_nCurrMGrpId = nId ;
    m_cCurrMGrp = mgData ;
    m_nCurrMch = GetMachine( m_cCurrMGrp.MGeoName) ;
-   m_stuMgr.Init( this) ;
+   if ( ! m_stuMgr.Init( this)) {
+      m_nCurrMGrpId = GDB_ID_NULL ;
+      return false ;
+   }
    m_stuMgr.Load() ;
    m_nPhasesCount = CalcPhaseCount() ;
    m_nCurrPhase = 0 ;
diff --git a/MachineLua.cpp b/MachineLua.cpp
index dcddb30..e203a88 100644
--- a/MachineLua.cpp
+++ b/MachineLua.cpp
@@ -804,7 +804,7 @@ Machine::LuaEmtTcPos( lua_State* L)
 
   // carico i dati della posizione cambio utensile
    if ( ! m_pMchLua->LoadMachineTcPos( sName, sParent, ptPos, vtTDir, vtADir, sGeo, vsAux))
-      return luaL_error( L, " Load Machine Standard Head failed") ;
+      return luaL_error( L, " Load Machine Tc Position failed") ;
 
   // restituisco l'indice della posizione cambio utensile
    int nTcPosId = m_pMchLua->GetTcPosId( sName) ;