Failed to activate Seti-syntax package

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After installing seti-syntax package and navigating from atom themes to activate, produces the following error.

Cannot read property 'toLowerCase' of undefined
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TypeError: Cannot read property 'toLowerCase' of undefined
at Object.setTheme (/home/cipher/.atom/packages/seti-syntax/lib/settings.coffee:96:44)
at Object.init (/home/cipher/.atom/packages/seti-syntax/lib/settings.coffee:38:16)
at Object.activate (/home/cipher/.atom/packages/seti-syntax/lib/main.coffee:3:84)
at ThemePackage.activateNow (/usr/share/atom/resources/app/static/:11:3409792)
at /usr/share/atom/resources/app/static/:14:8248
at ThemePackage.measure (/usr/share/atom/resources/app/static/:11:3406782)
at /usr/share/atom/resources/app/static/:14:8188
at new Promise ()
at ThemePackage.activate (/usr/share/atom/resources/app/static/:14:8100)
at PackageManager.activatePackage (/usr/share/atom/resources/app/static/:11:386057)
at /usr/share/atom/resources/app/static/:11:395593