From cc95d3771887093afc4d5e1e1b00f8bbd3c8d067 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20G=C3=B6m=C3=B6ri?= <peter@84codes.com>
Date: Fri, 11 Jul 2025 09:29:58 +0200
Subject: [PATCH] Handle type state being undefined for very old queues

Field #amqqueue.type_state can be undefined for queues declared on old
RabbitMQ versions before 3.8.0. Ensure `amqqueue:get_type_state/1`
always returns a map according to its type spec to make life of
calling code easier.
---
 deps/rabbit/src/amqqueue.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/deps/rabbit/src/amqqueue.erl b/deps/rabbit/src/amqqueue.erl
index 38c9065c657d..8bf5a2345f19 100644
--- a/deps/rabbit/src/amqqueue.erl
+++ b/deps/rabbit/src/amqqueue.erl
@@ -464,7 +464,7 @@ set_policy_version(#amqqueue{} = Queue, PV) ->
 % type_state (new in v2)
 
 -spec get_type_state(amqqueue()) -> map().
-get_type_state(#amqqueue{type_state = TState}) ->
+get_type_state(#amqqueue{type_state = TState}) when is_map(TState) ->
     TState;
 get_type_state(_) ->
     #{}.