Witness Node Crash - node.cpp:1626: void graphene::net::detail::node_impl:

[bangzi1001]

2785034ms th_a fork_database.cpp:66 push_block ] Pushing block to fork database that failed to link: 004c1b04ea59253b531c57c5a0e2f1da1cd76fd5, 4987652
2785034ms th_a fork_database.cpp:67 push_block ] Head: 4987733, 004c1b557aca90cee4bf5cab91d95f5b046f81e1
2785035ms th_a application.cpp:512 handle_block ] Error when pushing block:
3080000 unlinkable_block_exception: unlinkable block
block does not link to known chain
{}
th_a fork_database.cpp:87 _push_block

{"new_block":{"previous":"004c1b0381dd0e3e00b0f026133af7c54dc58fe8","timestamp":"2018-07-25T23:20:35","witness":"1.6.19","transaction_merkle_root":"a3dbb626e9185ad0ba36c6bb1ee2fc20a6d38e32","extensions":[],"witness_signature":"2029c5a0887eba8e76a89796047c2250aa8535d060592edd3850942474b3baffb8624d112ce88a236b0c9803e267ca8c66658f2d1d3c32aa508bc632e5f6d2fd8f","transactions":[{"ref_block_num":6914,"ref_block_prefix":3995239117,"expiration":"2018-07-25T23:21:03","operations":[[0,{"fee":{"amount":100000,"asset_id":"1.3.0"},"from":"1.2.2042","to":"1.2.1964","amount":{"amount":19962839,"asset_id":"1.3.0"},"extensions":[]}]],"extensions":[],"signatures":["202c78fbc20dad0961b4941e70945a992d51d407e4e3e5b7d2b4255e405a66d6e3566937c3ab96b7121c60b62fd7141127795b09b0b054d53806a88c280a47da63"],"operation_results":[[0,{}]]},{"ref_block_num":6914,"ref_block_prefix":3995239117,"expiration":"2018-07-25T23:21:03","operations":[[0,{"fee":{"amount":100000,"asset_id":"1.3.0"},"from":"1.2.2177","to":"1.2.2077","amount":{"amount":19931654,"asset_id":"1.3.0"},"extensions":[]}]],"extensions":[],"signatures":["204394a8b1e12a76e3897ce6e73c1ae2170ee84ccef7ccec4010a5f4756d358292793f7f87def290695a059fa85881414642db0c52579261358545d70a5bcbded9"],"operation_results":[[0,{}]]},{"ref_block_num":6914,"ref_block_prefix":3995239117,"expiration":"2018-07-25T23:21:04","operations":[[0,{"fee":{"amount":100000,"asset_id":"1.3.0"},"from":"1.2.2194","to":"1.2.2173","amount":{"amount":19267493,"asset_id":"1.3.0"},"extensions":[]}]],"extensions":[],"signatures":["2059d96086b1058ad9f2c23e9f1bf52c2dbcce4df9e4fec535f77751cd0436e42d0fb507d8ccfff95fba1baeba281424426f677aa495b39d735250e3eac39a800d"],"operation_results":[[0,{}]]},{"ref_block_num":6914,"ref_block_prefix":3995239117,"expiration":"2018-07-25T23:21:04","operations":[[0,{"fee":{"amount":100000,"asset_id":"1.3.0"},"from":"1.2.1671","to":"1.2.1751","amount":{"amount":18485013,"asset_id":"1.3.0"},"extensions":[]}]],"extensions":[],"signatures":["2073bd165ebf948b4ec98d4196462f3d4b1b3381a9878db15c05077fce5fa2f76251f08c961deb4191cc0423ab7db5681c59565617c818c41628819637112760b1"],"operation_results":[[0,{}]]}]}}
th_a  db_block.cpp:210 _push_block

gravity-testnet: /root/gravity-core/libraries/net/node.cpp:1626: void graphene::net::detail::node_impl::schedule_peer_for_deletion(const peer_connection_ptr&): Assertion `_closing_connections.find(peer_to_delete) == _closing_connections.end()' failed.
Aborted