Crashing Tor with SETCIRCUITPURPOSE

I seem to be able to consistently crash Tor, with nothing being added to the log file by doing the following:

alfa:# telnet localhost 9051 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. AUTHENTICATE ********** 250 OK EXTENDCIRCUIT 0 250 EXTENDED 24 SETCIRCUITPURPOSE 24 general Connection closed by foreign host. alfa:# telnet localhost 9051 Trying 127.0.0.1... telnet: Unable to connect to remote host: Connection refused alfa:~#

Trac:
Username: mickeyc