Same thing happened to me. See my post where I asked Aria minecraft command issues.
To just recover from the error screen blocking access from Aria, try press "Ctrl" and "/" (by default) . This should call out the Aria hover box where you can ask her things 'quicker'. Ask her anything in the hover box that might not trigger the same bug, and then reload Aria. She should be answering your newly asked question normally. Finally, delete the conversation causing this bug to avoid viewing it unintentionally and get bugged again.