Index: trunk/MagicSoft/Mars/mdata/MDataFormula.cc
===================================================================
--- trunk/MagicSoft/Mars/mdata/MDataFormula.cc	(revision 7418)
+++ trunk/MagicSoft/Mars/mdata/MDataFormula.cc	(revision 7421)
@@ -139,7 +139,6 @@
 
     fFormula = new TFormula;
-
-    //Must have a name otherwise all axis label disappear like a miracle
-    fFormula->SetName(fName);
+    // Must have a name otherwise all axis labels disappear like a miracle
+    fFormula->SetName(fName.IsNull()?"TFormula":fName);
 
     if (fFormula->Compile(txt))