From 814a7ee53e01b015a3f3e28e1ab3cf8752351bbe Mon Sep 17 00:00:00 2001
From: Alex Hultman <alexhultman@gmail.com>
Date: Tue, 28 Sep 2021 23:23:00 +0200
Subject: [PATCH] Clear outgoingMessages on last drained subscriber

---
 src/TopicTree.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/TopicTree.h b/src/TopicTree.h
index 73eef97..a837128 100644
--- a/src/TopicTree.h
+++ b/src/TopicTree.h
@@ -252,6 +252,11 @@ public:
             /* This one always resets needsDrainage before it calls any cb's.
              * Otherwise we would stackoverflow when sending after publish but before drain. */
             drainImpl(s);
+            
+            /* If we drained last subscriber, also clear outgoingMessages */
+            if (!drainableSubscribers) {
+                outgoingMessages.clear();
+            }
         }
     }