Otter integration breaks on alternate filetypes

[vhyrro]

Prerequisites

• I am using the latest stable release of Neovim
• I am using the latest version of the plugin

Neovim Version

0.10.0

Neorg setup

N/A

Actual behavior

Neorg seems to break whenever otter integration is activated and one tries to edit a file with an alternate filetype.

Expected behavior

No error.

Steps to reproduce

• Enter a .norg file
• Activate otter integration
• (optional) disable otter integration
• Move to a separate file

Potentially conflicting plugins

No response

Other information

(cc @benlubas, you're likely to know what the root cause of this issue is much faster than I am :p)

Below is the error log. It doesn't point to any individual Neorg path, but the error only triggers once the otter integration itself is activated.

Error detected while processing DiagnosticChanged Autocommands for "*":
Error executing lua callback: ...rro/.local/share/nvim/rocks/rocks_rtp/lua/otter/init.lua:184: attempt to index a nil value
stack traceback:
        ...rro/.local/share/nvim/rocks/rocks_rtp/lua/otter/init.lua:184: in function <...rro/.local/share/nvim/rocks/rocks_rtp/lua/otter/init.lua:183>
        [C]: in function 'nvim_exec_autocmds'
        ...0/nvim-linux64/share/nvim/runtime/lua/vim/diagnostic.lua:1033: in function 'set'
        ...im-linux64/share/nvim/runtime/lua/vim/lsp/diagnostic.lua:260: in function 'handle_diagnostics'
        ...im-linux64/share/nvim/runtime/lua/vim/lsp/diagnostic.lua:293: in function 'handler'
        ...0/nvim-linux64/share/nvim/runtime/lua/vim/lsp/client.lua:1005: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

Help

None

Implementation help

No response

[benlubas]

I'm having trouble with otter not even updating diagnostics anymore. I'll add this to the list of things to look into

[benlubas]

Can confirm that this also breaks with markdown files and is most likely a bug in otter.nvim