[BUG] Reloading a session with scnvim using Startify causes errors

[madskjeldgaard]

Describe the bug

When using SCNvim while using Startify (or probably other session managers as well), sometimes a problem occurs that causes the following error after loading a session that previously had scnvim running in it:

E5108: Error executing lua: .../nvim/site/pack/packer/opt/scnvim/lua/scnvim/postwin.lua:58: Failed to rename buffer                                                           
stack traceback:                                                                                                                                                              
        [C]: in function 'nvim_buf_set_name'                                                                                                                                  
        .../nvim/site/pack/packer/opt/scnvim/lua/scnvim/postwin.lua:58: in function 'create'                                                                                  
        .../nvim/site/pack/packer/opt/scnvim/lua/scnvim/postwin.lua:146: in function 'open'                                                                                   
        ...e/nvim/site/pack/packer/opt/scnvim/lua/scnvim/sclang.lua:54: in function 'default_fn'                                                                              
        ...e/nvim/site/pack/packer/opt/scnvim/lua/scnvim/action.lua:45: in function 'on_init'                                                                                 
        ...e/nvim/site/pack/packer/opt/scnvim/lua/scnvim/sclang.lua:210: in function 'start'                                                                                  
        ...al/share/nvim/site/pack/packer/opt/scnvim/lua/scnvim.lua:89: in function <...al/share/nvim/site/pack/packer/opt/scnvim/lua/scnvim.lua:88>   

Expected behavior

Steps to reproduce

1. :e myfile.scd
2. :SCNvimStart
3. :SSave scnvimerror
4. Close neovim
5. Re-open neovim
6. :SLoad scnvimerror

Additional context
Perhaps related to this?
#33

Information

• Operating system
  MacOS sonoma

• nvim --version

NVIM v0.9.2
Build type: Release
LuaJIT 2.1.0-beta3

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/opt/homebrew/Cellar/neovim/0.9.2/share/nvim"

Run :checkhealth for more info

• Package manager
  Packer.nvim

[madskjeldgaard]

The error prevents scnvim from starting after reload, and the only way to get it to start is to find the post window buffer called [scnvim] and closing it, before running SCNvimStart again