diff --git a/src/ve/velib05.cpp b/src/ve/velib05.cpp
index c94e8210f..81af71eed 100755
--- a/src/ve/velib05.cpp
+++ b/src/ve/velib05.cpp
@@ -411,6 +411,8 @@ TRiga_documento& TDocumentoEsteso::row(int index)
     if (_conai) extra[ne++] = _conai;
     if (_tic  ) extra[ne++] = _tic;
     if (_split) extra[ne++] = _split;
+		if(extra[index-n-1] == NULL)
+			fatal_box(format(FR("Non esiste la riga %d"), index));
     return *extra[index-n-1];
   }
 	return TDocumento::row(index);