Registering with duplicate email throws 500 error

[pdpinch]

Internal Server Error: /api/v1/register/ Traceback (most recent call last): File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response response = wrapped_callback(request, _callback_args, _callback_kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/newrelic-2.54.0.41/newrelic/hooks/framework_django.py", line 499, in wrapper return wrapped(_args, _kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view return view_func(_args, _kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/django/views/generic/base.py", line 71, in view return self.dispatch(request, _args, _kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/newrelic-2.54.0.41/newrelic/hooks/component_djangorestframework.py", line 27, in _nr_wrapper_APIViewdispatch return wrapped(_args, _kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/rest_framework/views.py", line 466, in dispatch response = self.handle_exception(exc) File "/app/.heroku/python/lib/python2.7/site-packages/rest_framework/views.py", line 463, in dispatch response = handler(request, _args, _kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/rest_framework/decorators.py", line 53, in handler return func(_args, _kwargs) File "./portal/views/registration.py", line 73, in register_view password=password File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/models.py", line 187, in create_user _extra_fields) File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/models.py", line 182, in _create_user user.save(using=self._db) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 734, in save force_update=force_update, update_fields=update_fields) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 762, in save_base updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 846, in _save_table result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 885, in _do_insert using=using, raw=raw) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/manager.py", line 127, in manager_method return getattr(self.get_queryset(), name)(_args, _kwargs) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py", line 920, in _insert return query.get_compiler(using=using).execute_sql(return_id) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 974, in execute_sql cursor.execute(sql, params) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/utils.py", line 97, in exit six.reraise(dj_exc_type, dj_exc_value, traceback) File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) File "/app/.heroku/python/lib/python2.7/site-packages/newrelic-2.54.0.41/newrelic/hooks/database_dbapi2.py", line 22, in execute args, *_kwargs) IntegrityError: duplicate key value violates unique constraint "auth_user_username_key" DETAIL: Key (username)=(tutko@mit.edu) already exists.