Fix bug found by persistent user who kept mailing me about broken charts. Which turned out to be broken indeed!
Fix bug found by persistent user who kept mailing me about broken charts. Which turned out to be broken indeed!

firefly-iii/firefly-iii,firefly-iii/firefly-iii,firefly-iii/firefly-iii,JC5/firefly-iii,JC5/firefly-iii,firefly-iii/firefly-iii