Index: trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java =================================================================== --- trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java (revision 16008) +++ trunk/src/org/openstreetmap/josm/gui/dialogs/validator/ValidatorTreePanel.java (revision 16010) @@ -129,5 +129,5 @@ } } - return "" + res + ""; + return res == null ? null : "" + res + ""; }