Question error_log too big, SSL debug

[SalvadorS]

Hello,

One of my boxes has a Debian with Plesk 12. We have a site with big error_log files. When I open the file I can see houndreds of lines like this:

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1897): OpenSSL: read 5/5 bytes from BIO#7f85f9caeee0 [mem: 7f85f8727df3] (BIO dump follows)

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1830): +-------------------------------------------------------------------------+

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1869): | 0000: 18 03 03 02 82 ..... |

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1875): +-------------------------------------------------------------------------+

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1897): OpenSSL: read 642/642 bytes from BIO#7f85f9cdeee0 [mem: 7f85f3727df8] (BIO dump follows)

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1830): +-------------------------------------------------------------------------+

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1869): | 0000: d1 8c 4e 84 5a 17 ae b6-e3 47 c0 a2 9e 7e b5 31 ..N.Z....G...~.1 |

[Tue Jun 26 03:23:59 2018] [debug] ssl_engine_io.c(1869): | 0010: 0f 96 2a fb 3c d3 7f 82-45 6d 4a 6b f6 61 61 b4 ..*.<...UmJ{.aa. |

How can I disable this debug lines?

Thanks