Invalid HTML on card: TypeError: Cannot read property 'addEventListener' of null

WaniKani API And Third-Party Apps
#1

I am getting this error when I try to preview @hinekidori ‘s TF sentences’ Kana Recall cards . Could you please help me with it ? It 's really a good deck . Thank you

#2

I can’t really directly help you but I did find this thread which might be helpful.