Pony 0.2.1 http.Client.apply() Assertion failed

gistfile1.txt

Assertion failed: (obj != NULL), function gc_recvobject, file src/libponyrt/gc/gc.c, line 158.
[New Thread 0x1413 of process 60217]
[New Thread 0x1503 of process 60217]
[New Thread 0x1603 of process 60217]
[New Thread 0x1703 of process 60217]

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x1413 of process 60217]
0x00007fff8bf51002 in __pthread_kill () from /usr/lib/system/libsystem_kernel.dylib
(gdb) bt
#0  0x00007fff8bf51002 in __pthread_kill () from /usr/lib/system/libsystem_kernel.dylib
#1  0x00007fff8ff635c5 in pthread_kill () from /usr/lib/system/libsystem_pthread.dylib
#2  0x00007fff97ce16e7 in abort () from /usr/lib/system/libsystem_c.dylib
#3  0x00007fff97ca8df8 in __assert_rtn () from /usr/lib/system/libsystem_c.dylib
#4  0x000000010002b4fa in gc_recvobject (ctx=0x1097ffe48, p=0x1097ca680, f=0x0) at src/libponyrt/gc/gc.c:158
#5  0x000000010002cd91 in pony_trace (ctx=0x1097ffe48, p=0x1097ca680) at src/libponyrt/gc/trace.c:43
#6  0x0000000100010cc0 in net_TCPConnection_$dispatch ()
#7  0x0000000100025220 in handle_message (ctx=0x1097ffe48, actor=0x1097d5400, msg=0x12a7ff6c0, notify=0x700000186e6f) at src/libponyrt/actor/actor.c:99
#8  0x0000000100024f7c in actor_run (ctx=0x1097ffe48, actor=0x1097d5400) at src/libponyrt/actor/actor.c:145
#9  0x0000000100031d44 in run (sched=0x1097ffe00) at src/libponyrt/sched/scheduler.c:261
#10 0x0000000100031b19 in run_thread (arg=0x1097ffe00) at src/libponyrt/sched/scheduler.c:303
#11 0x00007fff8ff61c13 in _pthread_body () from /usr/lib/system/libsystem_pthread.dylib
#12 0x00007fff8ff61b90 in _pthread_start () from /usr/lib/system/libsystem_pthread.dylib
#13 0x00007fff8ff5f375 in thread_start () from /usr/lib/system/libsystem_pthread.dylib
#14 0x0000000000000000 in ?? ()