diff --git a/src/sentry/sentry_apps/tasks/sentry_apps.py b/src/sentry/sentry_apps/tasks/sentry_apps.py
index 2d671ebd69b5..7e814442adbc 100644
--- a/src/sentry/sentry_apps/tasks/sentry_apps.py
+++ b/src/sentry/sentry_apps/tasks/sentry_apps.py
@@ -415,8 +415,49 @@ def _load_service_hook(organization_id: int | None, installation_id: int) -> Ser
             )
         return service_hook
     except ServiceHook.DoesNotExist:
+        # Attempt to repair the hook if the organization_id is missing
+        return _repair_hook_missing_organization_id(organization_id, installation_id)
+
+
+def _repair_hook_missing_organization_id(
+    organization_id: int | None, installation_id: int
+) -> ServiceHook | None:
+    """
+    Attempt to repair the hook if the organization_id is missing (there was a gap from
+    between 2025-08-26 and 2026-02-18)
+    TODO: Remove this once the gap is closed
+    """
+    if organization_id is None:
         return None
 
+    try:
+        service_hook = ServiceHook.objects.get(
+            installation_id=installation_id,
+            organization_id__isnull=True,
+        )
+    except ServiceHook.DoesNotExist:
+        return None
+    except ServiceHook.MultipleObjectsReturned:
+        # We can't tell which hook is live, and guessing would send an org's payloads
+        # to the wrong url. Fall through to the missing_servicehook halt instead.
+        logger.warning(
+            "service_hook.duplicate_hooks_missing_organization_id",
+            extra={"installation_id": installation_id},
+        )
+        return None
+
+    service_hook.organization_id = organization_id
+    service_hook.save(update_fields=["organization_id"])
+    logger.info(
+        "service_hook.repaired_missing_organization_id",
+        extra={
+            "service_hook_id": service_hook.id,
+            "installation_id": installation_id,
+            "organization_id": organization_id,
+        },
+    )
+    return service_hook
+
 
 @cache_func_for_models(
     [(ServiceHookProject, lambda hook_project: (hook_project.service_hook_id,))],
diff --git a/tests/sentry/sentry_apps/tasks/test_sentry_apps.py b/tests/sentry/sentry_apps/tasks/test_sentry_apps.py
index 1444977dd777..591725d65985 100644
--- a/tests/sentry/sentry_apps/tasks/test_sentry_apps.py
+++ b/tests/sentry/sentry_apps/tasks/test_sentry_apps.py
@@ -1708,6 +1708,60 @@ def test_does_not_send_if_event_not_in_app_events(
             mock_record=mock_record, outcome=EventLifecycleOutcome.FAILURE, outcome_count=1
         )
 
+    def test_repairs_service_hook_missing_organization_id(self, safe_urlopen: MagicMock) -> None:
+        with assume_test_silo_mode_of(ServiceHook):
+            ServiceHook.objects.filter(installation_id=self.install.id).update(organization_id=None)
+
+        workflow_notification(self.install.id, self.issue.id, "resolved", self.user.id)
+
+        ((_, kwargs),) = safe_urlopen.call_args_list
+        assert kwargs["url"] == self.sentry_app.webhook_url
+
+        with assume_test_silo_mode_of(ServiceHook):
+            hook = ServiceHook.objects.get(installation_id=self.install.id)
+        assert hook.organization_id == self.project.organization.id
+
+    def test_does_not_repair_when_multiple_hooks_missing_organization_id(
+        self, safe_urlopen: MagicMock
+    ) -> None:
+        self.create_service_hook(
+            actor=self.user,
+            org=self.project.organization,
+            project_ids=[],
+            events=["issue.resolved"],
+            installation_id=self.install.id,
+            application_id=self.sentry_app.application_id,
+            url=self.sentry_app.webhook_url,
+        )
+        with assume_test_silo_mode_of(ServiceHook):
+            ServiceHook.objects.filter(installation_id=self.install.id).update(organization_id=None)
+
+        with pytest.raises(SentryAppSentryError):
+            workflow_notification(self.install.id, self.issue.id, "resolved", self.user.id)
+        assert not safe_urlopen.called
+
+        with assume_test_silo_mode_of(ServiceHook):
+            assert not ServiceHook.objects.filter(
+                installation_id=self.install.id, organization_id__isnull=False
+            ).exists()
+
+    def test_does_not_repair_hook_belonging_to_another_organization(
+        self, safe_urlopen: MagicMock
+    ) -> None:
+        other_org = self.create_organization()
+        with assume_test_silo_mode_of(ServiceHook):
+            ServiceHook.objects.filter(installation_id=self.install.id).update(
+                organization_id=other_org.id
+            )
+
+        with pytest.raises(SentryAppSentryError):
+            workflow_notification(self.install.id, self.issue.id, "resolved", self.user.id)
+        assert not safe_urlopen.called
+
+        with assume_test_silo_mode_of(ServiceHook):
+            hook = ServiceHook.objects.get(installation_id=self.install.id)
+        assert hook.organization_id == other_org.id
+
 
 class TestWebhookRequests(TestCase):
     def setUp(self) -> None: