* Fixed issue [#988](https://github.com/jakubpawlowicz/clean-css/issues/988) - edge case in dropping default animation-duration.
* Fixed issue [#989](https://github.com/jakubpawlowicz/clean-css/issues/989) - edge case in removing unused at rules.
* Fixed issue [#1001](https://github.com/jakubpawlowicz/clean-css/issues/1001) - corrupted tokenizer state.
+* Fixed issue [#1006](https://github.com/jakubpawlowicz/clean-css/issues/1006) - edge case in handling invalid source maps.
* Fixed issue [#1008](https://github.com/jakubpawlowicz/clean-css/issues/1008) - edge case in breaking up `font` shorthand.
[4.1.9 / 2017-09-19](https://github.com/jakubpawlowicz/clean-css/compare/v4.1.8...v4.1.9)
originalPosition = maps[source].originalPositionFor(position);
}
+ if (!originalPosition || originalPosition.column < 0) {
+ return metadata;
+ }
+
if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
return originalPositionFor(maps, [line - 1, column, source], range, selectorFallbacks - 1);
}