diff --git a/EGnLuaAux.h b/EGnLuaAux.h
index 0698829..9346d7f 100644
--- a/EGnLuaAux.h
+++ b/EGnLuaAux.h
@@ -438,6 +438,8 @@ LuaGetGlobVar( lua_State* L, const std::string& sVar, T& Val)
       std::string sTab, sField ;
       SplitFirst( sVar, ".", sTab, sField) ;
       lua_getglobal( L, sTab.c_str()) ;
+      if ( ! lua_istable( L, -1))
+         return false ;
       bool bOk = LuaGetTabFieldParam( L, -1, sField.c_str(), Val) ;
       lua_pop( L, 1) ;
       return bOk ;
diff --git a/EGnLuaMgr.h b/EGnLuaMgr.h
index 3ee099f..93494c4 100644
--- a/EGnLuaMgr.h
+++ b/EGnLuaMgr.h
@@ -101,6 +101,8 @@ LuaMgr::CallFunction( const std::string& sFunName, int nRets, const Args&... par
       std::string sTab, sField ;
       SplitFirst( sFunName, ".", sTab, sField) ;
       lua_getglobal( m_pL, sTab.c_str()) ;
+      if ( ! lua_istable( m_pL, -1))
+         return false ;
       lua_getfield( m_pL, -1, sField.c_str()) ;
      // porto la funzione uno slot sotto e diminuisco lo stack di uno (per essere come caso sopra)
       lua_copy( m_pL, -1, -2) ;