3538803 - Error "invalid number: not a valid number string" when clicking on "System Replication" tab in HANA Cockpit

While clicking on "System Replication" tab in HANA Cockpit, you get the following error message: 

sql exception. Cause: SAP DBTech JDBC: [339]: invalid number: not a valid number string '' at implicit type conversion (at pos 38)

SELECT * FROM SYS_DATABASES.M_INIFILE_CONTENTS WHERE KEY='logshipping_max_retention_size';

the "VALUE" is empty when LAYER_NAME = 'SYSTEM'

Source: portal
Type: Productive System
System ID/Name: AD1 / ADS Prod Server
Product version: SAP NetWeaver 7.5
System managed by: onPrem
Install base item: ADS Prod Server
Sold product: SAP PO (SAP Netweaver)

KBA , HAN-DB , SAP HANA Database , HAN-DB-HA , SAP HANA High Availability (System Replication, DR, etc.) , HAN-CPT-CPT2-SR , SAP HANA Cockpit 2 (System Replication) , Problem