From 9f9e96ce9ee797024585af8515338f67bc0175d6 Mon Sep 17 00:00:00 2001
From: Naxess <30292137+Naxesss@users.noreply.github.com>
Date: Sun, 27 Jun 2021 15:40:09 +0200
Subject: [PATCH] Add check for `spanDuration` <= 0 prior to division

---
 osu.Game/Rulesets/Edit/Checks/CheckMutedObjects.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/osu.Game/Rulesets/Edit/Checks/CheckMutedObjects.cs b/osu.Game/Rulesets/Edit/Checks/CheckMutedObjects.cs
index 0559a8b0cd..a4ff921b7e 100644
--- a/osu.Game/Rulesets/Edit/Checks/CheckMutedObjects.cs
+++ b/osu.Game/Rulesets/Edit/Checks/CheckMutedObjects.cs
@@ -97,6 +97,10 @@ namespace osu.Game.Rulesets.Edit.Checks
             if (hitObject is IHasRepeats hasRepeats)
             {
                 double spanDuration = hasRepeats.Duration / hasRepeats.SpanCount();
+                if (spanDuration <= 0)
+                    // Prevents undefined behaviour in cases like where zero/negative-length sliders/hold notes exist.
+                    return EdgeType.None;
+
                 double spans = (time - hitObject.StartTime) / spanDuration;
                 double acceptableDifference = 1 / spanDuration; // 1 ms of acceptable difference, as with head/tail above.