browser-compat error log

➜  foundation-sites git:(chore/browser-compat) ✗ gulp javascript
[13:17:04] Using gulpfile ~/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/gulpfile.js
[13:17:04] Starting 'javascript:foundation'...
[13:17:04] Starting 'javascript:deps'...
[13:17:04] Starting 'javascript:docs'...
[13:17:13] Finished 'javascript:deps' after 9.17 s
[13:17:14] Finished 'javascript:docs' after 10 s
[13:17:17] Finished 'javascript:foundation' after 12 s
[13:17:17] Starting 'javascript'...
[13:17:17] Finished 'javascript' after 25 μs
[13:18:17] finished browser compatibility check: No Problems!
[13:18:26] finished browser compatibility check: No Problems!
[13:18:31] finished browser compatibility check: No Problems!
[13:18:31] finished browser compatibility check: No Problems!
[13:18:31] Encountered the following browser compatibility issues:
Browser: iOS Safari
	Version: 4.0-4.1, 4.2-4.3
		getComputedStyle:Partial Support - Partial support refers to not supporting getComputedStyle on pseudo-elements.

[13:18:31] Summary:
getComputedStyle
		API to get the current computed CSS styles applied to an element. This may be the current value applied by an animation or as set by a stylesheet.


[13:18:31] finished browser compatibility check
/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:132
				if (typeof browserConf.fail !== 'undefined' && (browserConf.report === versionRange[0] || browserConf.fail !== versionHigher([versionRange[0], conf[a].fail]))) {
				                                                                                                                                                    ^

ReferenceError: a is not defined
    at closure (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:132:153)
    at Array.reduce (native)
    at closure (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:184:52)
    at Array.reduce (native)
    at closure (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:203:45)
    at Array.reduce (native)
    at compat (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:262:25)
    at parseCompatFiles (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:444:9)
    at Request._callback (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/index.js:484:5)
    at Request.self.callback (/Users/ncoden/Documents/Documents/Projects/Programmation/Web/Forks/foundation-sites/node_modules/gulp-browser-compat/node_modules/request/request.js:200:22)