The error appears when I enter a reading (hiragana). It doesn’t mark it as right or wrong It skips to the next question. A meaning however still gets marked as right or wrong. It only started recently as I could still do lessons normally earlier today.
Tested on Firefox and Opera without any userscript active.
Log summary (currentLesson is not defined)
ReferenceError: currentLesson is not defined application-50adb145c80fb21bd48d5969fc64d134a7a2db96a04ad9630bf6e1ae938cf808.js:96:5905