fix: fixed invalid index referencing in table due to user-specified invalid mapping configuration

]

@@ -0,0 +1,20 @@
+---@type ChadrcConfig
+local M = {}
+
+-- Path to overriding theme and highlights files
+local highlights = require "custom.highlights"
+
+M.ui = {
+  theme = "jellybeans",
+  -- theme_toggle = { "onedark", "one_light" },
+
+  hl_override = highlights.override,
+  hl_add = highlights.add,
+}
+
+M.plugins = "custom.plugins"
+
+-- check core.mappings for table structure
+M.mappings = require "custom.mappings"
+
+return M

lua/core/utils.lua

@@ -53,38 +53,48 @@ end
 
 M.load_mappings = function(section, mapping_opt)
   vim.schedule(function()
-    local function set_section_map(section_values)
-      if section_values.plugin then
-        return
-      end
+    local function sec_section_map_func()
+      local function set_section_map(section_values)
+        if section_values.plugin then
+          return
+        end
 
-      section_values.plugin = nil
+        section_values.plugin = nil
 
-      for mode, mode_values in pairs(section_values) do
-        local default_opts = merge_tb("force", { mode = mode }, mapping_opt or {})
-        for keybind, mapping_info in pairs(mode_values) do
-          -- merge default + user opts
-          local opts = merge_tb("force", default_opts, mapping_info.opts or {})
+        for mode, mode_values in pairs(section_values) do
+          local default_opts = merge_tb("force", { mode = mode }, mapping_opt or {})
+          for keybind, mapping_info in pairs(mode_values) do
+            -- merge default + user opts
+            local opts = merge_tb("force", default_opts, mapping_info.opts or {})
 
-          mapping_info.opts, opts.mode = nil, nil
-          opts.desc = mapping_info[2]
+            mapping_info.opts, opts.mode = nil, nil
+            opts.desc = mapping_info[2]
 
-          vim.keymap.set(mode, keybind, mapping_info[1], opts)
+            vim.keymap.set(mode, keybind, mapping_info[1], opts)
+          end
         end
       end
+
+      local mappings = require("core.utils").load_config().mappings
+
+
+      if type(section) == "string" then
+        mappings[section]["plugin"] = nil
+        mappings = { mappings[section] }
+      end
+
+      for _, sect in pairs(mappings) do
+        set_section_map(sect)
+      end
     end
 
-    local mappings = require("core.utils").load_config().mappings
-
-    if type(section) == "string" then
-      mappings[section]["plugin"] = nil
-      mappings = { mappings[section] }
+    local ok, err = pcall(sec_section_map_func)
+    if ok == false then
+      local chadrc_path = vim.api.nvim_get_runtime_file("lua/custom/chadrc.lua", false)[1]
+      error(string.format("check mappings in %s =>  %s", chadrc_path, err))
     end
-
-    for _, sect in pairs(mappings) do
-      set_section_map(sect)
-    end
-  end)
+  end
+  )
 end
 
 M.lazy_load = function(plugin)