At some point I've started getting the error while trying to access the build page:

• The default value has been returned
• An error occurred while download data
• Cannot invoke "java.util.Map.size()" because "map" is null
• Please look at the Log
• Please check the configuration

The jenkins version is 2.519, plugin version is 444.vca_b_84d3703c2.

Thanks in advance.