MongoDB - decode failed on shell

PRIMARY> show dbs;
Wed Jun 13 10:45:05 decode failed. probably invalid utf-8 string [pJ@??]
Wed Jun 13 10:45:05 why: TypeError: malformed UTF-8 character sequence at offset 3
Wed Jun 13 10:45:05 Error: invalid utf8 shell/utils.js:1237

AAAAAAA!!!!!!!

/etc/init.d/mongodb stop

/etc/init.d/mongodb start

PRIMARY> show dbs;

admin 0.203125GB

db0 0.203125GB

db1 0.453125GB

db2 0.203125GB

db3 0.203125G

...

...

..

OK!!!!