debug version often fail to start on thread 'peer_connect' panicked

[garyyu]

thread 'peer_connect' panicked at 'called `Option::unwrap()` on a `None` value': src/libcore/option.rs:347stack backtrace:
   0: gotts_util::logger::send_panic_to_log::{{closure}}
             at util/src/logger.rs:241
   1: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:478
   2: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:381
   3: rust_begin_unwind
             at src/libstd/panicking.rs:308
   4: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
   5: core::panicking::panic
             at src/libcore/panicking.rs:49
   6: core::option::Option<T>::unwrap
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libcore/macros.rs:12
   7: gotts_store::lmdb::Store::get_ser_access
             at store/src/lmdb.rs:237
   8: gotts_store::lmdb::Batch::get_ser
             at store/src/lmdb.rs:334
   9: gotts_p2p::store::PeerStore::update_state
             at p2p/src/store.rs:183
  10: gotts_p2p::peers::Peers::update_state
             at p2p/src/peers.rs:427
  11: gotts_servers::gotts::seed::listen_for_addrs::{{closure}}
             at servers/src/gotts/seed.rs:335