When outline is shown, every time I close a buffer, I got this error.

Describe the bug

Using Astronvim, when ever I close a buff, I got this error.

Error executing vim.schedule lua callback: ...re/nvim/lazy/lspsaga.nvim/lua/lspsaga/symbol/outline.lua:203: Invalid 'buffer': Expected Lua number
stack traceback:
	[C]: in function 'nvim_buf_delete'
	...re/nvim/lazy/lspsaga.nvim/lua/lspsaga/symbol/outline.lua:203: in function ''
	vim/_editor.lua: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

Steps to reproduce

Using Astronvim with community lspsaga receipt, when I have the outline opened, and try to close a java buffer, I got the error.

Expected behavior

If the closed buffer is not the last buffer, the lspsaga outline should keep showing the outline for the current buff. If its the last buff, then I guess we should close the outline as well?

Neovim version (nvim -v)

0.10.0

lspsaga commit

d027f8b

Terminal name/version

western

Start at lua/lspsaga/symbol/outline.lua line 203 and reproduce the error with the outline open while closing a Java buffer in Neovim 0.10.0. Trace the scheduled callback and verify the outline remains attached to the current buffer, or closes when the last buffer is closed, without the invalid-buffer error.