tor_bug_occurred_: Bug: src/core/or/dos.c:697: dos_new_client_conn: Non-fatal assertion !(entry == NULL) failed. (Future instances of this warning will be silenced.) (on Tor 0.4.2.6 )

Hi there,
Receiving the below report, searched for 'src/core/or/dos.c:697' no hits, so opening ticket, please let me know if further info is needed to troubleshoot.
FreeBSD <> 12.1-RELEASE-p2 FreeBSD 12.1-RELEASE-p2 GENERIC amd64

Mar  1 13:53:33 <<hostname>> Tor[86742]: tor_bug_occurred_: Bug: src/core/or/dos.c:697: dos_new_client_conn: Non-fatal assertion !(entry == NULL) failed. (Future instances of this warning will be silenced.) (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug: Tor 0.4.2.6: Non-fatal assertion !(entry == NULL) failed in dos_new_client_conn at src/core/or/dos.c:697. Stack trace: (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x12f4acc <log_backtrace_impl+0x5c> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x12f0b76 <tor_bug_occurred_+0x1d6> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x118d9a5 <channel_do_open_actions+0xf5> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x118d88e <channel_change_state_open+0x2e> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x1191a57 <channel_tls_handle_state_change_on_orconn+0x67> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x1144946 <connection_or_set_state_open+0x26> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x11923ee <channel_tls_handle_cell+0x88e> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x1140d52 <connection_or_process_inbuf+0x152> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x114ddad <connection_handle_read+0x8fd> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x119e3ee <connection_add_impl+0x23e> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x8013d72b3 <event_base_assert_ok_nolock_+0xc23> at /usr/local/lib/libevent-2.1.so.7 (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x8013d318f <event_base_loop+0x53f> at /usr/local/lib/libevent-2.1.so.7 (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x11a0881 <do_main_loop+0xf1> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x113de68 <tor_run_main+0x128> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x113c656 <tor_main+0x66> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:53:33 <<hostname>> Tor[86742]: Bug:     0x113c309 <main+0x19> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: tor_bug_occurred_: Bug: src/core/or/dos.c:697: dos_new_client_conn: Non-fatal assertion !(entry == NULL) failed. (Future instances of this warning will be silenced.) (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug: Tor 0.4.2.6: Non-fatal assertion !(entry == NULL) failed in dos_new_client_conn at src/core/or/dos.c:697. Stack trace: (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x12f4acc <log_backtrace_impl+0x5c> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x12f0b76 <tor_bug_occurred_+0x1d6> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x118d9a5 <channel_do_open_actions+0xf5> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x118d88e <channel_change_state_open+0x2e> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x1191a57 <channel_tls_handle_state_change_on_orconn+0x67> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x1144946 <connection_or_set_state_open+0x26> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x11923ee <channel_tls_handle_cell+0x88e> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x1140d52 <connection_or_process_inbuf+0x152> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x114ddad <connection_handle_read+0x8fd> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x119e3ee <connection_add_impl+0x23e> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x8013d72b3 <event_base_assert_ok_nolock_+0xc23> at /usr/local/lib/libevent-2.1.so.7 (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x8013d318f <event_base_loop+0x53f> at /usr/local/lib/libevent-2.1.so.7 (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x11a0881 <do_main_loop+0xf1> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x113de68 <tor_run_main+0x128> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x113c656 <tor_main+0x66> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Mar  1 13:54:37 <<hostname>> Tor[86742]: Bug:     0x113c309 <main+0x19> at /usr/local/bin/tor (on Tor 0.4.2.6 )
Trac:
Username: sjcjonker
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