Got error on slicing blogs.log with eosio-blocklog

[zhopen]

Docker image is boscore/bos:v3.0.4
Got error on slicing blogs.log with eosio-blocklog.
But after stopping and starting nodeos， run normally。

root@test-inspur56:/eos/data-dir# eosio-blocklog -o block1-100.log --last 100
info  2020-07-13T11:33:28.703 thread-0  block_log.cpp:134             open                 ] Log is nonempty
info  2020-07-13T11:33:28.703 thread-0  block_log.cpp:165             open                 ] Index is nonempty
info  2020-07-13T11:33:28.703 thread-0  main.cpp:47                   read_log             ] existing block log contains block num 1 through block num 34019400
error 2020-07-13T11:33:28.703 thread-0  main.cpp:64                   read_log             ] database dirty flag set (likely due to unclean shutdown): only block_log blocks are available