Login failed for your GitHub account.

When opening 'Hosted Repositories' I'm getting the following message 3 times (also see attachment):

Login failed for your GitHub account.

The remote service said: 'Unable to cast object of type 'System.String' to type 
'System.Collections.Generic.IDictionary`2[System.String,System.Object]'.

All my GitHub repo's do show up in the 'Hosted Repositories', no repo is missing.

I can't remember which version, but this worked without errors before.

My account on Github is jerone.

Maybe related; I'm part of the organization OpenUserJs which has 3 repo's.