Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModel.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModel.java	(revision 17173)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModel.java	(revision 17174)
@@ -19,4 +19,5 @@
 import javax.swing.DefaultListSelectionModel;
 import javax.swing.ListSelectionModel;
+import javax.swing.SwingUtilities;
 import javax.swing.event.TableModelEvent;
 import javax.swing.event.TableModelListener;
@@ -123,5 +124,5 @@
         Collection<RelationMember> sel = getSelectedMembers();
         fireTableDataChanged();
-        setSelectedMembers(sel);
+        SwingUtilities.invokeLater(() -> setSelectedMembers(sel));
     }