fix nill exception
diff --git a/examples/lua/test_repo_name_extract.lua b/examples/lua/test_repo_name_extract.lua
index 86b63cd..62b15f8 100644
--- a/examples/lua/test_repo_name_extract.lua
+++ b/examples/lua/test_repo_name_extract.lua
@@ -31,7 +31,10 @@
         end
     else
         if pp[s] == "changes" or pp[s] == "projects" then
-            repo = "/"..pp[s+1]
+            repo = "/"
+            if pp[s+1] ~= nil then
+                repo = "/"..pp[s+1]
+	    end
 	    core.Info(repo)
             local sep = string.find(repo, "~")
             if sep ~= nil then