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-rw-r--r--synapse/events/third_party_rules.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/synapse/events/third_party_rules.py b/synapse/events/third_party_rules.py
index d94b1bb4d2..976d9fa446 100644
--- a/synapse/events/third_party_rules.py
+++ b/synapse/events/third_party_rules.py
@@ -217,6 +217,15 @@ class ThirdPartyEventRules:
         for callback in self._check_event_allowed_callbacks:
             try:
                 res, replacement_data = await callback(event, state_events)
+            except SynapseError as e:
+                # FIXME: Being able to throw SynapseErrors is relied upon by
+                # some modules. PR #10386 accidentally broke this ability.
+                # That said, we aren't keen on exposing this implementation detail
+                # to modules and we should one day have a proper way to do what
+                # is wanted.
+                # This module callback needs a rework so that hacks such as
+                # this one are not necessary.
+                raise e
             except Exception as e:
                 logger.warning("Failed to run module API callback %s: %s", callback, e)
                 continue