Unable to delete lag interface in MX device

[Jainpriyal]

While deleting lag interface in MX device, it is giving following error:
Error: /Stage[main]/Main/Netdev_lag[ae0]: Could not evaluate: undefined method `[]' for nil:NilClass

% puppet agent --test
Info: Retrieving pluginfacts
Info: Retrieving plugin
ldapname is deprecated and will be removed in a future version
Info: Caching catalog for choc-mx240-b.englab.juniper.net
Info: Applying configuration version '1416299665'
Error: /Stage[main]/Main/Netdev_lag[ae0]: Could not evaluate: undefined method `[]' for nil:NilClass
Notice: JUNOS: 

same code for deleting lag interface is working fine in other devices (EX4200, EX4300, qfx)