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The question is, if that's a bug or a feature :) The message comes from the official Steem.js library and it just tells you that you entered non base58 characters. But of course, it would be better to check the input before calling a method from the lib, so I will fix that in the coming days ;)

I see.
is Steemjs an official library?

Seems like there are different inputs - where non base58 should not occur and where they may happen.

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I will add a private key validation as soon as I find time for this. The Steem.js lib offers a wifIsValid( privKey, pubKey ) method to check against a public key, so it's really easy to implement.

is Steemjs an official library?

Yes, it's being maintained by Steemit and the source can be found on GitHub. I think it is still the mostly used JavaScript library for accessing the Steem blockchain, but there are already better/newer alternatives available. (for example DSteem)

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