JSON List structure corruption

Hello, We have a list structure within JSON and it works well most of the times. However it is corrupt sometimes leading to failure of the whole object.

Expected structure should be
[] Items
{} 0
{} 1
{} 2

However it appears like

This is not always reproducible but only sometimes. Whenever this happen whole java requester session not failing to commit to the server.

Any help would be appreciated!