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-rw-r--r--synapse/push/baserules.py13
1 files changed, 12 insertions, 1 deletions
diff --git a/synapse/push/baserules.py b/synapse/push/baserules.py
index c3e072033c..440205e80c 100644
--- a/synapse/push/baserules.py
+++ b/synapse/push/baserules.py
@@ -49,6 +49,7 @@ kind, etc, etc.
 """
 
 import itertools
+import logging
 from typing import Dict, Iterator, List, Mapping, Sequence, Tuple, Union
 
 import attr
@@ -56,6 +57,8 @@ import attr
 from synapse.config.experimental import ExperimentalConfig
 from synapse.push.rulekinds import PRIORITY_CLASS_MAP
 
+logger = logging.getLogger(__name__)
+
 
 @attr.s(auto_attribs=True, slots=True, frozen=True)
 class PushRule:
@@ -199,8 +202,16 @@ def compile_push_rules(rawrules: List[PushRule]) -> PushRules:
             collection = rules.sender
         elif rule.priority_class == 1:
             collection = rules.underride
+        elif rule.priority_class <= 0:
+            logger.info(
+                "Got rule with priority class less than zero, but doesn't override a base rule: %s",
+                rule,
+            )
+            continue
         else:
-            raise Exception(f"Unknown priority class: {rule.priority_class}")
+            # We log and continue here so as not to break event sending
+            logger.error("Unknown priority class: %", rule.priority_class)
+            continue
 
         collection.append(rule)