Error leading to crash
 

So I'm having some issues with the daemon randomly crashing

One of them is this:

DBD::mysql::st execute failed: Incorrect string value: '\xF0\x9F\x8E\x83' for column 'lastName' at row 1 at .//HLstats.plib line 213.
Unable to execute query (player_flushdb_player_2):

UPDATE
hlstats_Players
SET
connection_time = connection_time + ?,
lastName=?,
clan=?,
kills=kills + ?,
deaths=deaths + ?,
suicides=suicides + ?,
skill=?,
headshots=headshots + ?,
shots=shots + ?,
hits=hits + ?,
teamkills=teamkills + ?,
last_event=?,
last_skill_change=?,
death_streak=IF(?>death_streak,?,death_streak ),
kill_streak=IF(?>kill_streak,?,kill_streak),
hideranking=IF(hideranking=3,0,hideranking),
activity = 100
WHERE
playerId=?

Incorrect string value: '\xF0\x9F\x8E\x83' for column 'lastName' at row 1 at .//HLstats.plib line 213.

At least I think it caused a crash since it's the last entry in the log
Do any of you guys have any idea what this means?
I'm guessing a query to the mysql database messes up and I'm guessing that the question marks means it's missing some data?
But what causes this? And more importantly, is it possible to fix it?