Fixed a crash that could occur when multiple threads tried to access the ActiveStreams collection at the same time.
Fixed a crash that could occur when multiple threads tried to access the
ActiveStreams collection at the same time.

underwater/qdms,qusma/qdms,leo90skk/qdms,underwater/qdms,qusma/qdms,Jumaga2015/qdms,leo90skk/qdms,KBurov/qdms