Hi Asif,
You have to give more context, where in your OutSystems application do you get this error.
You say a script related to Bitmoji. If possible share an OML in which the error is reproducable, if that is not possible share screen prints on how you integrated the Bitmoji javascript in OutSystems.
Please also edit your original post to include if this is Traditional-, Reactive- or Mobile web application that you are developing.
Regards,
Daniel