SassNumberException: Number must be a number: contrib/sassy/extensions/compass/stylesheets/compass/typography/_vertical_rhythm.scss::94 Source: $lines: if($round-to-nearest-half-line, ceil(2 * $font-size / $base-line-height) / 2, ceil($font-size / $base-line-height)) in SassNumber->op_times() (line 186 of sites/all/libraries/phpsass/script/literals/SassNumber.php).
Error appears in logs: