I create field:

"emoji": {
            "type": "multiEnum",
            "storeArrayValues": true,
            "options": ["💤","❗","⚡","👑","❓","🚑","🚀","🐢","⬆","⬇","🙂","🙁","👍","👎","🧠","🥇","🥈","🥉","🏃","🚗","🧟","📞","💬","🌛","⏳","🔔","🔍","💩"],
            "style": {"💤": null,"❗": null,"⚡": null,"👑": null,"❓": null,"🚑": null,"🚀": null,"🐢": null,"⬆": null,"⬇": null,"🙂": null,"🙁": null,"👍": null,"👎": null,
					  "🧠": null,"🥇": null,"🥈": null,"🥉": null,"🏃": null,"🚗": null,"🧟‍": null,"📞": null,"💬": null,"🌛": null,"⏳": null,"🔔": null,"🔍": null,"💩": null},
            "isCustom": true,
            "displayAsLabel": true,
            "maxCount": 3,
            "displayAsList": false
        }
		
When I edit field in form I got 500.

Chrome request payload is: {"emoji":["💤","⏳","👑"]}


Error log record: 
[2020-04-08 07:09:33] Espo.DEBUG: API (22007) SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xF0\x9F\x92\xA4' for column `espotest`.`array_value`.`value` at row 1; 
					  PUT /api/v1/Case/5d241494d2c4a626a; Input data: {"emoji":["💤","⏳","👑"]}; Route pattern: /:controller/:id; Route params: Array (     [controller] => Case     [id] => 5d241494d2c4a626a )  [] []
[2020-04-08 07:09:33] Espo.ERROR: (22007) SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xF0\x9F\x92\xA4' for column `espotest`.`array_value`.`value` at row 1; 
					  PUT /api/v1/Case/5d241494d2c4a626a; line: 983, file: /home/espotest/public_html/application/Espo/ORM/DB/Mapper.php [] []		
					  
What's wrong?