I used `io.reactivex:rxandroid:0.24.0` and `io.reactivex:rxjava-string:0.22.0` After ugrade dependency to `io.reactivex:rxandroid:0.25.0`, app became freezes on ``` public static String joinedBy(List<String> src, String separator) { return StringObservable.join(Observable.from(src), separator).toBlocking().single(); } ```