Discovery import error

As UD discovery is running we are seeing our UCMDB Error log being filled with the following error:

2016-01-04 12:07:06,764 ERROR [Process Results Thread-MZ_Integrated_Network Infra_Network_Host Connection by SNMP] (SettingsReaderImpl.java:65) - setting [reconciliation.merge.operations.fuse] cannot be converted using converter [SettingValueConverterInteger]. value is: [null].
java.lang.NumberFormatException: For input string: ""

Is there any easy fix or knowledge as to why this message should occur a lot?

Currently running uCMDB v10.20 CUP1 CP16

Thanks,

Dave