Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java =================================================================== --- /trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java (revision 16009) +++ /trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java (revision 16010) @@ -129,5 +129,5 @@ } } - return "" + res + ""; + return res == null ? null : "" + res + ""; }