Undefined variable w:m1/Invalid arguments for function matchdelete

[cyboflash]

I have this installed as a plugin though Vundle

" Syntax highlighting for LLVM
Plugin 'Superbil/llvm.vim.git', {'name': 'llvm-syn-hl'}

The issue occurs if I start vim, split a window vertically and attempt to begin a new line above or below the cursor (press O or o in the normal mode)

Not quite sure what causes the problem.

" Syntax highlighting for LLVM
Plugin 'Superbil/llvm.vim.git', {'name': 'llvm-syn-hl'}

Here is the output of :messages

Messages maintainer: Bram Moolenaar <Bram@vim.org>
"polls/urls.py" 6L, 115C
Error detected while processing InsertEnter Auto commands for "*":
E121: Undefined variable: w:m1
Error detected while processing InsertEnter Auto commands for "*":
E116: Invalid arguments for function matchdelete
1 line less; before #1  4 seconds ago
1 line less; before #2  1 seconds ago