Warnings even when the WP_DEBUG set to false

Thanks all of you for your response the issue got resolved. The problem was with cached copy of this link https://vreqenz-stream.de/shop/ . I had WP Rocket for caching and apparently it is not doing very good job of purging the cache.
I got sure that it is cache issue when I defined the WP_CACHE as false which was true earlier and the warnings disappeared.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)