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Trigger keeps creating error

I am not understanding why I keep getting this error. Can anyone explain? I am entering it through HeidiSQL:

################################
# CHECK Triggers for WM_CLIENT
################################

CREATE TRIGGER trig_client_gndr 
BEFORE INSERT ON WM_CLIENT 
FOR EACH ROW 
BEGIN 
	IF UPPER(NEW.ClGender) NOT IN ('M','F') THEN 
		SET NEW.ClGender ='U'; 
	END IF; 
END;

I get the error: SQL Error (1064): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near " at line 10.

Line 10 is SET NEW ClGender = 'U';

Answer Answered by Elena Stepanova in this comment.

Since your trigger creation contains semicolons, you need to change the statement delimiter. Something like

DELIMITER | 
CREATE TRIGGER trig_client_gndr 
BEFORE INSERT ON WM_CLIENT 
FOR EACH ROW 
BEGIN 
	IF UPPER(NEW.ClGender) NOT IN ('M','F') THEN 
		SET NEW.ClGender ='U'; 
	END IF; 
END |
DELIMITER ;
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