npm i error on glslViewer

[dsubject]

On npm i, gls-viewer throws an error:

[email protected] install /home/pi/Openframe-glslViewer
./install.sh

Installing glslViewer...
./install.sh: line 36: [: ==: unary operator expected
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package glslviewer

npm ERR! Linux 5.10.92-v7+
npm ERR! argv "/home/pi/.nvm/versions/node/v6.9.5/bin/node" "/home/pi/.nvm/versions/node/v6.9.5/bin/npm" "install"
npm ERR! node v6.9.5
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! [email protected] install: ./install.sh
npm ERR! Exit status 100
npm ERR!
npm ERR! Failed at the [email protected] install script './install.sh'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the openframe-glslviewer package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! ./install.sh
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs openframe-glslviewer
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls openframe-glslviewer
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /home/pi/Openframe-glslViewer/npm-debug.log

I don't really need the extension in the near future so I've temporarily fixed the problem by removing it from the install.sh and package.json files, however, it might be needed down the line.