Broken UI after register with existing data

[Sh1karno]

PC

1. Register page shuld be open
2. User should be registered

STR

1. enter existing email in database
2. enter valid password
3. click on register button

ER
the error "emeil already exists" should be displayed

AR
the error is not displayed, an infinite loading occurs, if the refresh of the UI page is disabled

API Log:

2019-08-23T16:41:28.724876+00:00 app[web.1]: 2019-08-23T16:41:28.724Z - �[31merror�[39m: Failed to create new user test@test.com
2019-08-23T16:41:28.725608+00:00 app[web.1]: 2019-08-23T16:41:28.724Z - �[31merror�[39m:  message=E11000 duplicate key error index: heroku_xjgn5lw6.users.$username_1 dup key: { : "test@test.com" }, stack=MongoError: E11000 duplicate key error index: heroku_xjgn5lw6.users.$username_1 dup key: { : "test@test.com" }
2019-08-23T16:41:28.725611+00:00 app[web.1]:     at Function.create (/app/node_modules/mongodb-core/lib/error.js:43:12)
2019-08-23T16:41:28.725613+00:00 app[web.1]:     at toError (/app/node_modules/mongodb/lib/utils.js:149:22)
2019-08-23T16:41:28.725619+00:00 app[web.1]:     at coll.s.topology.insert (/app/node_modules/mongodb/lib/operations/collection_ops.js:859:39)
2019-08-23T16:41:28.725620+00:00 app[web.1]:     at /app/node_modules/mongodb-core/lib/connection/pool.js:397:18
2019-08-23T16:41:28.725629+00:00 app[web.1]:     at process._tickCallback (internal/process/next_tick.js:61:11), driver=true, name=MongoError, index=0, code=11000, errmsg=E11000 duplicate key error index: heroku_xjgn5lw6.users.$username_1 dup key: { : "test@test.com" }

[Sh1karno]

RETEST:

• Imposible to register with existing data

TEST RESULT:
AR=ER bug can be closed