Unexpected Application Error!

"undefined" is not valid JSON

SyntaxError: "undefined" is not valid JSON
    at JSON.parse (<anonymous>)
    at s (https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:738559)
    at f (https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:659087)
    at https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:670396
    at https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:699273
    at https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:185295
    at rl (https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:2231663)
    at Sc (https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:2251890)
    at https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:2248480
    at S (https://weightlossbuddy.com/static/js/main.a01dc79a.js:2:2730281)