Unexpected Application Error!

Cannot read properties of undefined (reading 'push')

TypeError: Cannot read properties of undefined (reading 'push')
    at https://www.digitalbook.io/static/js/577.f066cd27.chunk.js:1:45931
    at Ul (https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:186732)
    at t.unstable_runWithPriority (https://www.digitalbook.io/static/js/vendors-27545368.fdd73202.js:2:46426)
    at qo (https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:127051)
    at Al (https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:186193)
    at bl (https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:177683)
    at https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:127274
    at t.unstable_runWithPriority (https://www.digitalbook.io/static/js/vendors-27545368.fdd73202.js:2:46426)
    at qo (https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:127051)
    at Go (https://www.digitalbook.io/static/js/vendors-91c40cd8.35ce664e.js:2:127219)