Check if the buffer is valid when trying to attach TS

init.lua

@@ -954,6 +954,9 @@ do
   ---@param buf integer
   ---@param language string
   local function treesitter_try_attach(buf, language)
+    -- Check if the buffer is valid (might not be after install completes)
+    if not vim.api.nvim_buf_is_valid(buf) then return end
+
     -- Check if a parser exists and load it
     if not vim.treesitter.language.add(language) then return end
     -- Enable syntax highlighting and other treesitter features