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Help figuring out what is causing this log entry




My syslog is being filled up with 

Jan  7 00:10:06 magpie slapd[9168]: slap_global_control: unrecognized control: 1.3.6.1.4.1.4203.666.5.16
Jan  7 00:10:06 magpie slapd[9168]: slap_global_control: unrecognized control: 1.3.6.1.4.1.4203.666.5.16
Jan  7 00:10:06 magpie slapd[9168]: slap_global_control: unrecognized control: 1.3.6.1.4.1.4203.666.5.16
Jan  7 00:10:06 magpie slapd[9168]: slap_global_control: unrecognized control: 1.3.6.1.4.1.4203.666.5.16

What is causing this? I have googled this log entry a number of times but have found no solution. We are running Debian nine.

Thanks,

Kelvin Jones