Index: trunk/src/org/openstreetmap/josm/data/osm/DataSet.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/osm/DataSet.java	(revision 14221)
+++ trunk/src/org/openstreetmap/josm/data/osm/DataSet.java	(revision 14222)
@@ -957,6 +957,6 @@
             if (!eventsToFire.isEmpty()) {
                 lock.readLock().lock();
-                lock.writeLock().unlock();
                 try {
+                    lock.writeLock().unlock();
                     if (eventsToFire.size() < MAX_SINGLE_EVENTS) {
                         for (AbstractDatasetChangedEvent event : eventsToFire) {