diff --git a/lua/pantran/utils/buffer.lua b/lua/pantran/utils/buffer.lua
index 0312e62..bea337d 100644
--- a/lua/pantran/utils/buffer.lua
+++ b/lua/pantran/utils/buffer.lua
@@ -64,8 +64,15 @@ end
 function buffer.get_mappings(buf, mode)
   local mappings = {}
   for _, mapping in ipairs(vim.api.nvim_buf_get_keymap(buf, mode)) do
-    local id = tonumber(mapping.rhs:match("^.+%[(%d+)%]"))
-    mappings[mapping.lhs] = id and buffer.callbacks[buf][id] or mapping.rhs
+    local rhs = mapping.rhs
+    if rhs ~= nil then
+      local id = rhs:match("^.+%[(%d+)%]")
+      id = id and tonumber(id) or nil
+      local cb = (id and buffer.callbacks[buf] and buffer.callbacks[buf][id]) or rhs
+      if cb ~= nil then
+        mappings[mapping.lhs] = cb
+      end
+    end
   end
   return mappings
 end