throw unknown error when trying previewing definition

[CoolPlayLin]

Describe the bug

When I use gp(custom keymap) to preview definition in lua file, it throws below error

Steps to reproduce

1. use any lua file for test
2. press gp
3. get error

Expected behavior

show the definition of var/function/class

Neovim version (nvim -v)

NVIM v0.10.0-dev-1988+g1ef60ea65

lspsaga commit

e71cddc9d4c1dd97c026814777b810df988daed2

Terminal name/version

wezterm 20230712-072601-f4abf8fd