Error executing vim.schedule

Error executing vim.schedule lua callback: ...site/pack/packer/start/lspsaga.nvim/lua/lspsaga/util.lua:248: attempt to call field 'get_clients' (a nil value) stack traceback: ...site/pack/packer/start/lspsaga.nvim/lua/lspsaga/util.lua:248: in function 'get_offset_encoding' .../start/lspsaga.nvim/lua/lspsaga/codeaction/lightbulb.lua:110: in function 'render' .../start/lspsaga.nvim/lua/lspsaga/codeaction/lightbulb.lua:137: in function <.../start/lspsaga.nvim/lua/lspsaga/codeaction/lightbulb.lua:135>