From de688869d6d0680cc0047eb7958c951c1988f3d5 Mon Sep 17 00:00:00 2001
From: Alex Hultman <alexhultman@gmail.com>
Date: Thu, 17 Oct 2019 01:23:27 +0200
Subject: [PATCH] Filter triggered topics without subscribers

---
 src/TopicTreeDraft.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/TopicTreeDraft.h b/src/TopicTreeDraft.h
index 0f832ad..9e5af6a 100644
--- a/src/TopicTreeDraft.h
+++ b/src/TopicTreeDraft.h
@@ -295,6 +295,19 @@ public:
             return;
         }
 
+        /* bug fix: Filter triggered topics without subscribers */
+        int numFilteredTriggeredTopics = 0;
+        for (int i = 0; i < numTriggeredTopics; i++) {
+            if (triggeredTopics[i]->subs.size()) {
+                triggeredTopics[numFilteredTriggeredTopics++] = triggeredTopics[i];
+            }
+        }
+        numTriggeredTopics = numFilteredTriggeredTopics;
+
+        if (!numTriggeredTopics) {
+            return;
+        }
+
         /* bug fix: update min, as the one tracked via subscribe gets invalid as you unsubscribe */
         min = (Subscriber *)UINTPTR_MAX;
         for (int i = 0; i < numTriggeredTopics; i++) {