silviomoreto/bootstrap-select — pull request #841 by yuxel (2014-12-27 23:41:15+00:00)
Title: Fixed less compiling issue

https://github.com/silviomoreto/bootstrap-select/blob/master/less/bootstrap-select.less#L229

This compiled into

.bootstrap-select.show-menu-arrow.open > .btn {
z-index: 1035 + 1;
}

which is not valid CSS syntax.

Math oparations should be wrapped with parantheses.