Multi-vote fails with delegated account

[ckamm]

On the mango-dao realm, delegate voting power to another key. Then, as that key, try to vote on multiple proposals at once with the multi-vote mode. The following error happens:

TypeError: m[0] is undefined
    NextJS 6
        t
        s
        _invoke
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        o
        r
_app-e5253c72a4ce27d5.js:356:8143835

It's possible that this error would happen even without the delegation. Voting on single proposals with the delegate works fine.