Index: trunk/src/org/openstreetmap/josm/plugins/PluginHandler.java
===================================================================
--- trunk/src/org/openstreetmap/josm/plugins/PluginHandler.java	(revision 16920)
+++ trunk/src/org/openstreetmap/josm/plugins/PluginHandler.java	(revision 16921)
@@ -36,4 +36,5 @@
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.FutureTask;
@@ -278,5 +279,5 @@
      * All installed and loaded plugins (resp. their main classes)
      */
-    static final Collection<PluginProxy> pluginList = new LinkedList<>();
+    static final Collection<PluginProxy> pluginList = new CopyOnWriteArrayList<>();
 
     /**