fatalerror with cyrillic string

[tureck1y]

I get the fatal error while trying to init itemSuffix: Can't form Range with upperBound < lowerBound. Reproducing with same Cyrillic string inside text and suggestion ( "Москва" for example) I can suggest this fix:

fileprivate func filter(forceShowAll addAll: Bool) {
...
if item.title.lowercased().hasPrefix(textToFilter) {
...
  let itemSuffix: Substring = indexFrom < item.title.endIndex ? item.title.suffix(from: indexFrom) : ""
...
  }
}

[tureck1y]

Xcode version 10.2.1

[innvonix6166]

i have same Error