Setting foldmethod causes vim-clap to crash

Hey guys,

First of all, great plugin, I really like what you have created here. Keep up the great work. 

**Describe the bug**
I got a bug with the plugin [vim-clap](https://github.com/liuchengxu/vim-clap).
After a while vim-clap providers will result in an error message and resulting in a floating window without content. I'm not sure if this is a bug on your, vim-clap or neovim core side. 
When i tried to create a minimal vimrc i noticed that this bug only appears when `foldmethod=expr foldexpr=nvim_treesitter#foldexpr()` is set.

**To Reproduce**
Steps to reproduce the behavior:
1. Minimal vimrc
```viml
let mapleader = ','

call plug#begin('~/.config/nvim/plugged')
	Plug 'nvim-treesitter/nvim-treesitter'
	Plug 'liuchengxu/vim-clap'
call plug#end()

nnoremap <leader>q :Clap files<CR>

lua << EOF
require'nvim-treesitter.configs'.setup {
	highlight = {
		enable = true,                    -- false will disable the whole extension
	},
	ensure_installed = { -- one of 'all', 'language' or a list of languages
		'c',
	}
}
EOF

set foldmethod=expr foldexpr=nvim_treesitter#foldexpr()
```
2. Go for example to neovim repo
3. Open random c file. Example: `nvim -u ~/minimalrc.vim src/nvim/ui.c`
4. Open another file with `:Clap files` or `<leader>q`. e.g. `src/tree_sitter/parser.c`
5. Try opening vim-clap again triggers error message:
```
Error detected while processing function clap#[41]..clap#for[39]..clap#floating_win#open[17]..clap#_init[3]..48[4]..47[7]..clap#job#regular#forerunner#start[1]..<SNR>52_run_maple_command[3]..clap#spinner#refresh[1]..<SNR>47_set_spinner[2]..clap#spinner#set:
line    2:
Error executing lua callback: /usr/share/nvim/runtime/lua/vim/treesitter.lua:215: invalid start
```
Pressing enter opens vim-claps floating window without content.
6. If message is not triggered, try opening more files with vim-clap or move around in the file. It is not entirely deterministic when it fails.

**Expected behavior**
vim-clap opens normally without triggering a error message and being able to open a new file.

**Output of `:checkhealth nvim_treesitter`**

<details>
<code>

health#nvim_treesitter#check
========================================================================
## Installation
  - OK: `git` executable found.
  - OK: `cc` executable found.

## html parser healthcheck
  - OK: html parser found.
  - OK: `highlights.scm` found.
  - WARNING: No `locals.scm` query found for html
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for html
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## typescript parser healthcheck
  - OK: typescript parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - WARNING: No `textobjects.scm` query found for typescript
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## markdown parser healthcheck
  - OK: markdown parser found.
  - WARNING: No `highlights.scm` query found for markdown
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `locals.scm` query found for markdown
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for markdown
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## regex parser healthcheck
  - OK: regex parser found.
  - OK: `highlights.scm` found.
  - WARNING: No `locals.scm` query found for regex
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for regex
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## c parser healthcheck
  - OK: c parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - OK: `textobjects.scm` found.

## java parser healthcheck
  - OK: java parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - WARNING: No `textobjects.scm` query found for java
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## python parser healthcheck
  - OK: python parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - OK: `textobjects.scm` found.

## yaml parser healthcheck
  - OK: yaml parser found.
  - WARNING: No `highlights.scm` query found for yaml
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `locals.scm` query found for yaml
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for yaml
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## cpp parser healthcheck
  - OK: cpp parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - OK: `textobjects.scm` found.

## toml parser healthcheck
  - OK: toml parser found.
  - WARNING: No `highlights.scm` query found for toml
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `locals.scm` query found for toml
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for toml
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## lua parser healthcheck
  - OK: lua parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - WARNING: No `textobjects.scm` query found for lua
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## ruby parser healthcheck
  - OK: ruby parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - WARNING: No `textobjects.scm` query found for ruby
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## go parser healthcheck
  - OK: go parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - OK: `textobjects.scm` found.

## scala parser healthcheck
  - OK: scala parser found.
  - WARNING: No `highlights.scm` query found for scala
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `locals.scm` query found for scala
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for scala
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## rust parser healthcheck
  - OK: rust parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - WARNING: No `textobjects.scm` query found for rust
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## json parser healthcheck
  - OK: json parser found.
  - OK: `highlights.scm` found.
  - WARNING: No `locals.scm` query found for json
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for json
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## javascript parser healthcheck
  - OK: javascript parser found.
  - OK: `highlights.scm` found.
  - OK: `locals.scm` found.
  - WARNING: No `textobjects.scm` query found for javascript
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## css parser healthcheck
  - OK: css parser found.
  - OK: `highlights.scm` found.
  - WARNING: No `locals.scm` query found for css
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for css
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## c_sharp parser healthcheck
  - OK: c_sharp parser found.
  - WARNING: No `highlights.scm` query found for c_sharp
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `locals.scm` query found for c_sharp
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for c_sharp
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## bash parser healthcheck
  - OK: bash parser found.
  - OK: `highlights.scm` found.
  - WARNING: No `locals.scm` query found for bash
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter
  - WARNING: No `textobjects.scm` query found for bash
    - ADVICE:
      - Open an issue at https://github.com/nvim-treesitter/nvim-treesitter

## Missing parsers
  - WARNING: Some parsers are not installed:
    nix
    swift
    elm
    vue
    ocaml
    haskell
    jsdoc
    julia
    php
    tsx
    - ADVICE:
      - Install them using `:TSInstall language

</code>
</details>

**Output of `nvim --version`**
```
NVIM v0.5.0-593-g1ca67a73c
Build type: RelWithDebInfo
LuaJIT 2.0.5
Compilation: /usr/lib/ccache/bin/cc -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -g -Og -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/home/conni/.cache/yay/neovim-git/src/build/config -I/home/conni/.cache/yay/neovim-git/src/neovim-git/src -I/usr/include -I/home/conni/.cache/yay/neovim-git/src/build/src/nvim/auto -I/home/conni/.cache/yay/neovim-git/src/build/include
Compiled by conni@home

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

Run :checkhealth for more info
```

**Additional context**
Installing vim-claps binaries does not fix this bug so I left this one out.


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Setting foldmethod causes vim-clap to crash #194

Conni2461
openedon Jul 16, 2020

health#nvim_treesitter#check

Installation

html parser healthcheck

typescript parser healthcheck

markdown parser healthcheck

regex parser healthcheck

c parser healthcheck

java parser healthcheck

python parser healthcheck

yaml parser healthcheck

cpp parser healthcheck

toml parser healthcheck

lua parser healthcheck

ruby parser healthcheck

go parser healthcheck

scala parser healthcheck

rust parser healthcheck

json parser healthcheck

javascript parser healthcheck

css parser healthcheck

c_sharp parser healthcheck

bash parser healthcheck

Missing parsers

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