collapsed_connection Plugin Errors

Hi Guys.
I been using trafficserver for over a year with all the good stuff it holds still there are bugs that are yet not fixed

one of the common bug in a plugin experimental called collapsed_connection
and here's the output
FATAL: InkAPI.cc:989: failed assert `!"Plugin tries to use a continuation which is deleted"`
/usr/local/bin/traffic_server - STACK TRACE:
/usr/local/lib/libtsutil.so.5(+0x1e897)[0x2b587580c897]
/usr/local/lib/libtsutil.so.5(+0x1d84f)[0x2b587580b84f]
/usr/local/bin/traffic_server[0x4b73b3]
/usr/local/bin/traffic_server(HttpSM::state_api_callout(int, void*)+0x102)[0x5ae762]
/usr/local/bin/traffic_server(HttpSM::state_cache_open_read(int, void*)+0x170)[0x5af510]
/usr/local/bin/traffic_server(HttpSM::main_handler(int, void*)+0xbd)[0x5b319d]
/usr/local/bin/traffic_server(HttpCacheSM::state_cache_open_read(int, void*)+0x156)[0x5910c6]
/usr/local/bin/traffic_server(Cache::open_read(Continuation*, INK_MD5*, HTTPHdr*, CacheLookupHttpConfig*, CacheFragType, char*, int)+0x642)[0x6dfd12]
/usr/local/bin/traffic_server(CacheProcessor::open_read(Continuation*, URL*, bool, HTTPHdr*, CacheLookupHttpConfig*, long, CacheFragType)+0x9b)[0x6beecb]
/usr/local/bin/traffic_server(HttpCacheSM::open_read(URL*, HTTPHdr*, CacheLookupHttpConfig*, long)+0x81)[0x591381]
/usr/local/bin/traffic_server(HttpSM::do_cache_lookup_and_read()+0xfb)[0x5a163b]
/usr/local/bin/traffic_server(HttpSM::set_next_state()+0x7aa)[0x5b3c2a]
/usr/local/bin/traffic_server(HttpSM::state_api_callout(int, void*)+0x2c0)[0x5ae920]
/usr/local/bin/traffic_server(HttpSM::state_api_callback(int, void*)+0x82)[0x5b3382]
/usr/local/bin/traffic_server(TSHttpTxnReenable+0x244)[0x4c9c34]
/usr/local/libexec/trafficserver/collapsed_connection.so(+0x2edf)[0x2b587b651edf]
/usr/local/libexec/trafficserver/collapsed_connection.so(+0x4714)[0x2b587b653714]
/usr/local/libexec/trafficserver/collapsed_connection.so(+0x4b90)[0x2b587b653b90]
/usr/local/bin/traffic_server(EThread::process_event(Event*, int)+0x170)[0x73e030]
/usr/local/bin/traffic_server(EThread::execute()+0x7e1)[0x73ec51]
/usr/local/bin/traffic_server[0x73d94a]

each time this happens the server is being restarted

much regards