Merge branch 'mobile'

1 files changed, 1 insertions, 1 deletions

diff --git a/public/assets/javascripts/util.js b/public/assets/javascripts/util.js
index 58dcc3a..b92dcf3 100644
--- a/public/assets/javascripts/util.js
+++ b/public/assets/javascripts/util.js
@@ -31,7 +31,7 @@ function quantize(n,a){ return round(n / a) * a }
 function max(a,b){ return Math.max(a,b) }
 function min(a,b){ return Math.min(a,b) }
 function abs(n){ return Math.abs(n) }
-function sign(n){ return Math.abs(n)/n }
+function sign(n){ return n ? Math.abs(n)/n : 0 }
 function pow(n,b) { return Math.pow(n,b) }
 function exp(n) { return Math.exp(n) }
 function log(n){ return Math.log(n) }