Hi Adam,
I have replicated your issue on our end and not getting error in latest version.
Please upgrade Your QuickApps Version. In case you need any further help or want to discuss the same further please feel free to log a case with our support team of QuickApp through website only.
PS: You can try to use qCalenderView instead of qListform as a workaround process share your findings with us.
Thanks and Regards,
Deepak
AgreeYa Support Group