diff --git a/ImportBtlx.cpp b/ImportBtlx.cpp
index b531d7a..1fc31fc 100644
--- a/ImportBtlx.cpp
+++ b/ImportBtlx.cpp
@@ -1127,7 +1127,7 @@ ImportBtlx::ReadUserReferencePlane( pugi::xml_node node)
    VectY.z = node.child( "Position").child( "YVector").attribute( "Z").as_double() ;
 
    Frame3d FrRef ;
-   FrRef.Set( Origin, VectX, VectY, VectX ^ VectY) ;  
+   FrRef.Set( Origin, VectX, VectY, VectX ^ VectY) ;
 
    MapURefPlanes.emplace( id, FrRef) ;
 
@@ -1580,6 +1580,8 @@ ImportBtlx::ReadShape( pugi::xml_node node)
 
   // Vertici delle facce
    INTVECTOR vAux ;  // vettore per salvare i vertici di una faccia 
+   if ( sFacesVertices.back() != ' ')
+      sFacesVertices += " " ;
    while( ( str_end = sFacesVertices.find( " ", str_start)) != string::npos ) {
       int val = std::stoi( sFacesVertices.substr( str_start, str_end - str_start)) ;
       str_start = str_end + 1 ;
@@ -1595,6 +1597,8 @@ ImportBtlx::ReadShape( pugi::xml_node node)
   // Coordinate dei vertici
    str_start = 0 ;
    DBLVECTOR vAux2 ; // vettore per salvare le coordinate di un punto
+   if ( sCoordPoints.back() != ' ')
+      sCoordPoints += " " ;
    while( ( str_end = sCoordPoints.find( " ", str_start)) != string::npos ){
       double val = std::stod( sCoordPoints.substr( str_start, str_end - str_start)) ;
       str_start = str_end + 1 ;
diff --git a/ImportBtlxProc.cpp b/ImportBtlxProc.cpp
index 941af64..8438698 100644
--- a/ImportBtlxProc.cpp
+++ b/ImportBtlxProc.cpp
@@ -2757,7 +2757,11 @@ ImportBtlx::ReadSContourParams( pugi::xml_node process, int nType, int nOtherId,
             LOG_ERROR( GetEExLogger(), "  Error reading Part Process: FreeContour Contour Reference Plane unknown") ;
             return false ;
          }
-         frRef = MapURefPlanes[nSide] ;      
+         frRef = MapURefPlanes[nSide] ;
+         if ( ! frRef.IsValid()) {
+            LOG_ERROR( GetEExLogger(), ("  Error reading Part Process: FreeContour User Reference Plane " + to_string( nSide) + " is not valid").c_str()) ;
+            return false ;
+         }
       }
 
       string sDes ;