HS intermittently fails: Non-fatal assertion failed in send_introduce1

When running 0.3.4.7-rc on Buster from deb.tpo

[WARN] Bug:     /usr/bin/tor(_start+0x2a) [0x55edbc918eea]
[WARN] Bug:     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7fd267a49b17]
[WARN] Bug:     /usr/bin/tor(main+0x19) [0x55edbc918e99]
[WARN] Bug:     /usr/bin/tor(tor_main+0x3a) [0x55edbc9190ea]
[WARN] Bug:     /usr/bin/tor(tor_run_main+0x1005) [0x55edbc921155]
[WARN] Bug:     /usr/bin/tor(do_main_loop+0x205) [0x55edbc91ea85]
[WARN] Bug:     /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(event_base_loop+0x5a7) [0x7fd26873f537]
[WARN] Bug:     /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(+0x229ba) [0x7fd26873e9ba]
[WARN] Bug:     /usr/bin/tor(+0x5271e) [0x55edbc91c71e]
[WARN] Bug:     /usr/bin/tor(connection_handle_read+0xa73) [0x55edbc9decf3]
[WARN] Bug:     /usr/bin/tor(+0x11e016) [0x55edbc9e8016]
[WARN] Bug:     /usr/bin/tor(channel_tls_handle_cell+0x4db) [0x55edbc9a3e4b]
[WARN] Bug:     /usr/bin/tor(command_process_cell+0x318) [0x55edbc9c2368]
[WARN] Bug:     /usr/bin/tor(circuit_receive_relay_cell+0x2c4) [0x55edbc9448f4]
[WARN] Bug:     /usr/bin/tor(+0x788bb) [0x55edbc9428bb]
[WARN] Bug:     /usr/bin/tor(rend_process_relay_cell+0x293) [0x55edbc94b9b3]
[WARN] Bug:     /usr/bin/tor(hs_client_receive_rendezvous_acked+0x79) [0x55edbca31a89]
[WARN] Bug:     /usr/bin/tor(connection_ap_attach_pending+0x178) [0x55edbc9e1e58]
[WARN] Bug:     /usr/bin/tor(connection_ap_handshake_attach_circuit+0x3bd) [0x55edbc9c0f3d]
[WARN] Bug:     /usr/bin/tor(hs_client_send_introduce1+0x232) [0x55edbca31382]
[WARN] Bug:     /usr/bin/tor(tor_bug_occurred_+0xb9) [0x55edbca6e499]
[WARN] Bug:     /usr/bin/tor(log_backtrace+0x43) [0x55edbca537a3]
[WARN] Bug: Non-fatal assertion !(ip == NULL) failed in send_introduce1 at ../src/or/hs_client.c:559. Stack trace:
[WARN] tor_bug_occurred_(): Bug: ../src/or/hs_client.c:559: send_introduce1: Non-fatal assertion !(ip == NULL) failed.

Trac:
Username: tgragnato