`TypeError: e.eq is not a function` while calling stakerRewardsMultiEras

[mutantcornholio]

• I'm submitting a ...

• [x] Bug report
• [ ] Feature request
• [ ] Support request
• [ ] Other

• What is the current behavior and expected behavior? Here's the code:

  const stakerRewards = await api.derive.staking.stakerRewardsMultiEras(["1zugcag7cJVBtVRnFxv5Qftn7xKAnR6YJ9x4x3XLgGgmNnS"], [1477]);
  console.log(stakerRewards);

While trying to execute it at https://polkadot.js.org/apps/, I get

TypeError: e.eq is not a function
    at https://polkadot.js.org/apps/modu.feacb3d8bf903221.js:1:61475
    at Array.some (<anonymous>)
    at https://polkadot.js.org/apps/modu.feacb3d8bf903221.js:1:61456
    at Array.filter (<anonymous>)
    at xn (https://polkadot.js.org/apps/modu.feacb3d8bf903221.js:1:61442)
    at https://polkadot.js.org/apps/modu.feacb3d8bf903221.js:1:63668
    at e._subscribe (https://polkadot.js.org/apps/modu.e085438fec7e90eb.js:1:6819)
    at e._trySubscribe (https://polkadot.js.org/apps/modu.7c3b262d6289bfdf.js:2:30316)
    at https://polkadot.js.org/apps/modu.7c3b262d6289bfdf.js:2:30238
    at o (https://polkadot.js.org/apps/modu.7c3b262d6289bfdf.js:2:59112)

• Please tell us about your environment: https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc-polkadot.luckyfriday.io#/js