Equals on AggregateAndProof throws

[mpetrunic]

Ideally, equals method should catch stuff and return false. But curious what could have caused this

(node:17070) UnhandledPromiseRejectionWarning: Error: Boolean value must be true or false
    at BooleanType.assertValidValue (/home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/types/basic/boolean.js:35:13)
    at BooleanType.equals (/home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/types/basic/abstract.js:74:10)
    at BitListStructuralHandler.equals (/home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/backings/structural/array.js:57:35)
    at /home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/backings/structural/container.js:83:37
    at Array.every (<anonymous>)
    at ContainerStructuralHandler.equals (/home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/backings/structural/container.js:79:46)
    at ContainerType.equals (/home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/types/composite/abstract.js:54:30)
    at /home/mpetrunic/projects/eth2/lodestar/packages/lodestar/lib/db/api/beacon/repositories/aggregateAndProof.js:51:46
    at CompositeListTreeHandler.findIndex (/home/mpetrunic/projects/eth2/lodestar/node_modules/@chainsafe/ssz/lib/backings/tree/array.js:393:11)
    at /home/mpetrunic/projects/eth2/lodestar/packages/lodestar/lib/db/api/beacon/repositories/aggregateAndProof.js:50:27