ERROR - server failed: Error: invalid blockhash about electrs HOT 8 CLOSED

2018-07-16T12:00:01.135+00:00 - ERROR - server failed: Error: invalid blockhash
Caused by: non-string value: {"ancestorcount":1,"ancestorfees":580,"ancestorsize":144,"depends":[],"descendantcount":2,"descendantfees":16311,"descendantsize":1774,"fee":0.0000058,"height":532144,"modifiedfee":0.0000058,"size":144,"time":1531737031,"wtxid":"3a7dc9d94ed9cd957f68659f70e893e4277efd7fd3203ca9f6fbc063661cd0c7"}
stack backtrace:
   0:     0x55c93f0e0b0c - backtrace::backtrace::trace::h44f27ad6608f02da
   1:     0x55c93f0e0162 - backtrace::capture::Backtrace::new_unresolved::hb555da2dec445946
   2:     0x55c93f0dfa37 - error_chain::backtrace::imp::InternalBacktrace::new::hc1c04021afee31b3
   3:     0x55c93f0dfda4 - <error_chain::State as core::default::Default>::default::he24c386d1d298d64
   4:     0x55c93f0a41c8 - electrs::daemon::parse_hash::h8f337262d06c180c
   5:     0x55c93f0a8cee - electrs::daemon::Daemon::getbestblockhash::h776026da8f347ee8
   6:     0x55c93f0830d6 - electrs::app::App::update::he774d357af833399
   7:     0x55c93f008932 - electrs::main::h5294e30fc465d8cf
   8:     0x55c93f00dcd2 - std::rt::lang_start::{{closure}}::hc74e7e3dcbd83f22
   9:     0x55c93f4bd1f2 - std::rt::lang_start_internal::{{closure}}::h72602870b4a34363
                        at libstd/rt.rs:59
                         - std::panicking::try::do_call::hc2917ab2c572e22d
                        at libstd/panicking.rs:310
  10:     0x55c93f4db159 - __rust_maybe_catch_panic
                        at libpanic_unwind/lib.rs:105
  11:     0x55c93f4c46e5 - std::panicking::try::h3777f1f99a655493
                        at libstd/panicking.rs:289
                         - std::panic::catch_unwind::hab6d1467193fc938
                        at libstd/panic.rs:374
                         - std::rt::lang_start_internal::h106bcdfb2e3beaf8
                        at libstd/rt.rs:58
  12:     0x55c93f009103 - main
  13:     0x7f4fba0672b0 - __libc_start_main
  14:     0x55c93f006799 - _start
  15:                0x0 - <unknown>