E121: Undefined variable: b:Liveupdating when using subdocuments

[vegarab]

Whenever I add a new buffer containing a .tex file that has been included from my main file (where vim-live-latex-preview is running), I get the following error on cursor movement (or save, :w):

Error detected while processing function UpdatePDF:
line 1:
E121: Undefined variable: b:Liveupdating
Press ENTER or type command to continue

The included file is included using the \include{subdoc.tex} command, in my main.tex file. Further, the subdoc.tex has its first line set to %!TEX root = main.tex

The plugin is installed using Vundle. I experience the same behaviour when loading the plugin with Pathogen. PATH variable has been set: export PATH="${PATH}:${HOME}/.vim/bundle/vim-live-latex-preview/bin/"

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I'm not very familiar with vim-scripting but find it baffling that I get this error. The variable in question is clearly stated globally on line 30 of ftplugin/tex/live-latex-review.vim. The plugin works flawlessly when working in a single document.