diff --git a/lua/navigator.lua b/lua/navigator.lua
index 8e1c427..57de288 100644
--- a/lua/navigator.lua
+++ b/lua/navigator.lua
@@ -4,9 +4,10 @@ _NgConfigValues ={
   code_action_icon = ' ',
   width = nil,   -- valeu of cols TODO allow float e.g. 0.6
   height = nil,
-  on_attach = function(client, bufnr)
-    -- your on_attach will be called at end of navigator on_attach
-  end,
+  on_attach = nil,
+  -- function(client, bufnr)
+  --   -- your on_attach will be called at end of navigator on_attach
+  -- end,
   sumneko_root_path = vim.fn.expand("$HOME") .. "/github/sumneko/lua-language-server",
   sumneko_binary = vim.fn.expand("$HOME") .. "/github/sumneko/lua-language-server/bin/macOS/lua-language-server",
   code_action_prompt = {
diff --git a/lua/navigator/diagnostics.lua b/lua/navigator/diagnostics.lua
index f9b591d..78077dd 100644
--- a/lua/navigator/diagnostics.lua
+++ b/lua/navigator/diagnostics.lua
@@ -31,7 +31,13 @@ local diag_hdlr = function(err, method, result, client_id, br, config)
       item.col = v.range.start.character + 1
       item.uri = uri
       local head = "🐛"
-      if v.severity > 1 then
+      if v.severity == 1 then
+        head = "🈲"
+      end
+      if v.severity == 2 then
+        head = "☣️"
+      end
+      if v.severity > 2 then
         head = "👎"
       end
       local bufnr = vim.uri_to_bufnr(uri)
@@ -67,6 +73,7 @@ M.diagnostic_handler =
     update_in_insert = false
   }
 )
+
 M.show_diagnostic = function()
   vim.lsp.diagnostic.get_all()
 
@@ -91,10 +98,9 @@ M.show_diagnostic = function()
     end
     -- log(display_items)
     if #display_items > 0 then
-      gui.new_list_view({items = display_items, api = "🚑 Diagnostic"})
+      gui.new_list_view({items = display_items, api = "🚑🐛 Diagnostic "})
     end
   end
 end
 
-
 return M
diff --git a/lua/navigator/lspclient/attach.lua b/lua/navigator/lspclient/attach.lua
index b0cde9d..c062ccc 100644
--- a/lua/navigator/lspclient/attach.lua
+++ b/lua/navigator/lspclient/attach.lua
@@ -75,7 +75,9 @@ M.on_attach = function(client, bufnr)
   local capabilities = vim.lsp.protocol.make_client_capabilities()
   capabilities.textDocument.completion.completionItem.snippetSupport = true
   local config = require'navigator'.config_value
-  if config ~= nil then config.on_attach(client, bufnr) end
+  if config ~= nil and config.on_attach ~= nil then
+    config.on_attach(client, bufnr)
+  end
 end
 
 M.setup = function(cfg)