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-rw-r--r--synapse/handlers/deactivate_account.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/handlers/deactivate_account.py b/synapse/handlers/deactivate_account.py
index 816e1a6d79..d74d135c0c 100644
--- a/synapse/handlers/deactivate_account.py
+++ b/synapse/handlers/deactivate_account.py
@@ -16,6 +16,7 @@ import logging
 from typing import TYPE_CHECKING, Optional
 
 from synapse.api.errors import SynapseError
+from synapse.handlers.device import DeviceHandler
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.types import Codes, Requester, UserID, create_requester
 
@@ -76,6 +77,9 @@ class DeactivateAccountHandler:
             True if identity server supports removing threepids, otherwise False.
         """
 
+        # This can only be called on the main process.
+        assert isinstance(self._device_handler, DeviceHandler)
+
         # Check if this user can be deactivated
         if not await self._third_party_rules.check_can_deactivate_user(
             user_id, by_admin