From e5d7d7aaccda5fe8d6643097e3f890ea07cc0a10 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 12 Jan 2026 19:47:40 +0100
Subject: [PATCH] extra protection

---
 wled00/bus_manager.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/wled00/bus_manager.cpp b/wled00/bus_manager.cpp
index fbe78898..dbd8ffae 100644
--- a/wled00/bus_manager.cpp
+++ b/wled00/bus_manager.cpp
@@ -1309,7 +1309,8 @@ int BusManager::add(BusConfig &bc) {
       if (!theBus->isOk()) continue;
       // check for overlap
       unsigned theStart = theBus->getStart();
-      unsigned theEnd = theStart + theBus->getLength() - 1;
+      unsigned theLen = theBus->getLength();
+      unsigned theEnd = (theLen > 0) ? theStart + theLen - 1 : theStart;
       // see https://stackoverflow.com/questions/3269434/whats-the-most-efficient-way-to-test-if-two-ranges-overlap
       if ((newStart <= theEnd) && (theStart <= newEnd)) {  // catches all overlap scenarios - including "new is including (around) another range"
         foundOverlap = true;