CPUJan2016 - WebLogic Server 12.1.2.0.8 OPatch apply error

Since 19th January 2016 the Critical Patch Update for January 2016 is out. In case you are trying to apply the CPUJan2016 against an Oracle WebLogic Server 12.1.2 you may run into following error: Verifying the update... [ Error during Update inventory for apply Phase]. Detail: There are 1 copy files under ORACLE_HOME that are not patched. Files check failed: Some files under ORACLE_HOME are not patched. Please see logfile for details. [ Error during Update inventory for apply Phase]. Detail: OPatch failed: ApplySession failed in system modification...