Index: /applications/editors/josm/plugins/HouseNumberTaggingTool/src/org/openstreetmap/josm/plugins/housenumbertool/TagDialog.java
===================================================================
--- /applications/editors/josm/plugins/HouseNumberTaggingTool/src/org/openstreetmap/josm/plugins/housenumbertool/TagDialog.java	(revision 36082)
+++ /applications/editors/josm/plugins/HouseNumberTaggingTool/src/org/openstreetmap/josm/plugins/housenumbertool/TagDialog.java	(revision 36083)
@@ -447,5 +447,5 @@
 
         try {
-            if (pluginDir.mkdirs()) {
+            if (pluginDir.isDirectory() || pluginDir.mkdirs()) {
                 try (
                         FileOutputStream file = new FileOutputStream(fileName);