diff --git a/synapse/push/push_rule_evaluator.py b/synapse/push/push_rule_evaluator.py
index 11032491af..8e0d3a416d 100644
--- a/synapse/push/push_rule_evaluator.py
+++ b/synapse/push/push_rule_evaluator.py
@@ -18,8 +18,6 @@ import logging
import re
from typing import Pattern
-from six import string_types
-
from synapse.events import EventBase
from synapse.types import UserID
from synapse.util.caches import register_cache
@@ -131,7 +129,7 @@ class PushRuleEvaluatorForEvent(object):
# XXX: optimisation: cache our pattern regexps
if condition["key"] == "content.body":
body = self._event.content.get("body", None)
- if not body:
+ if not body or not isinstance(body, str):
return False
return _glob_matches(pattern, body, word_boundary=True)
@@ -147,7 +145,7 @@ class PushRuleEvaluatorForEvent(object):
return False
body = self._event.content.get("body", None)
- if not body:
+ if not body or not isinstance(body, str):
return False
# Similar to _glob_matches, but do not treat display_name as a glob.
@@ -244,7 +242,7 @@ def _flatten_dict(d, prefix=[], result=None):
if result is None:
result = {}
for key, value in d.items():
- if isinstance(value, string_types):
+ if isinstance(value, str):
result[".".join(prefix + [key])] = value.lower()
elif hasattr(value, "items"):
_flatten_dict(value, prefix=(prefix + [key]), result=result)
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