Issue with null check in query

While executing query with r2dbcEntityTemplate and with binding null query takes a lot of time and it fails

Anyone can help in this scenario?

SELECT
	A.NAME,
	A.BRANCH,
	A.CITY,
	A.MECHANISM,
	B.DESCRIPTION
FROM
MainBank A
LEFT JOIN Payscale B ON
A.PAYMECH = B.REDDIVCODE
LEFT JOIN CUSTOMER C ON
A.ID = C.ID
WHERE
(:mobile IS NULL OR C.MOBILE = :mobile)
AND
(:city IS NULL OR A.CITY = :city)