diff --git a/pyproject.toml b/pyproject.toml
index 01409549597071..9ef18b78e283e3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -644,3 +644,16 @@ module = [
 disallow_any_generics = true
 disallow_untyped_defs = true
 # end: stronger typing
+
+# begin: possibly-undefined checks for issue team critical code
+[[tool.mypy.overrides]]
+module = [
+  "sentry.issues.*",
+  "sentry.tasks.post_process",
+  "sentry.event_manager",
+  "sentry.grouping.*",
+  "sentry.tasks.store",
+  "sentry.ingest.consumer.processors"
+]
+enable_error_code = ["possibly-undefined"]
+# end: possibly-undefined
diff --git a/src/sentry/tasks/post_process.py b/src/sentry/tasks/post_process.py
index 8812eab86375c7..f74f0ffc1e000e 100644
--- a/src/sentry/tasks/post_process.py
+++ b/src/sentry/tasks/post_process.py
@@ -1068,6 +1068,7 @@ def _get_replay_id(event):
         kafka_payload = transform_event_for_linking_payload(replay_id, group_event)
     except ValueError:
         metrics.incr("post_process.process_replay_link.id_invalid")
+        return
 
     publisher.publish(
         "ingest-replay-events",