Index: trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/ComboMultiSelect.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/ComboMultiSelect.java	(revision 13478)
+++ trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/ComboMultiSelect.java	(revision 13483)
@@ -112,4 +112,8 @@
         public Component getListCellRendererComponent(JList<? extends PresetListEntry> list, PresetListEntry item, int index,
                 boolean isSelected, boolean cellHasFocus) {
+
+            if (list == null || item == null) {
+                return lbl;
+            }
 
             // Only return cached size, item is not shown