From 58281b4cd5e5e999c4a25c8bf0833d7f134096dc Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 12 Jan 2026 19:31:53 +0100
Subject: [PATCH] handle zero-length edge case

---
 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 72291319..96e38ae8 100644
--- a/wled00/bus_manager.cpp
+++ b/wled00/bus_manager.cpp
@@ -1297,7 +1297,8 @@ int BusManager::add(BusConfig &bc) {
   if (newBus == nullptr) return numBusses; // WLEDMM early exit if bus creation failed
 
   unsigned newStart = newBus->getStart();
-  unsigned newEnd = newStart + max(newBus->getLength() - 1, 0); // "max" needed for single-pixel busses
+  unsigned newLen = newBus->getLength();
+  unsigned newEnd = (newLen > 0) ? newStart + newLen - 1 : newStart; // handle zero-length edge case (only happens when bus could not initialize)
   // WLEDMM check if added bus overlaps with any existing bus
   bool foundOverlap = false;
   unsigned busCount = getNumBusses();