Index: /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/actions/PasteRelationsAction.java
===================================================================
--- /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/actions/PasteRelationsAction.java	(revision 33122)
+++ /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/actions/PasteRelationsAction.java	(revision 33123)
@@ -114,4 +114,7 @@
         } catch (IllegalStateException e) {
             Main.warn(e);
+        } catch (NullPointerException e) {
+            // JDK-6322854: On Linux/X11, NPE can happen for unknown reasons, on all versions of Java
+            Main.error(e);
         }
     }