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-rw-r--r--synapse/rest/client/v2_alpha/register.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 93f9223708..25dab6f9c0 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -224,9 +224,10 @@ class RegisterRestServlet(RestServlet):
             if k not in body:
                 absent.append(k)
 
-        existingUid = self.hs.get_datastore().get_user_id_by_threepid(
+        existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
             'email', body['email']
         )
+
         if existingUid is not None:
             raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)