Index: /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/customurl/OpenPageAction.java
===================================================================
--- /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/customurl/OpenPageAction.java	(revision 33701)
+++ /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/customurl/OpenPageAction.java	(revision 33702)
@@ -94,5 +94,8 @@
         }
         try {
-            OpenBrowser.displayUrl(addr);
+            // See #12836 - do not load invalid history
+            if (!addr.endsWith("/0/history")) {
+                OpenBrowser.displayUrl(addr);
+            }
         } catch (Exception ex) {
             Logging.log(Logging.LEVEL_ERROR, "Can not open URL " + addr, ex);