From 6f65d64779a2fe69f8e2772a1257348eb58a7f47 Mon Sep 17 00:00:00 2001
From: WilliamQiufeng <williamqiufeng@outlook.com>
Date: Sat, 17 Aug 2024 14:05:51 +0800
Subject: [PATCH] Return difficulty 0 when StrainSolverData is empty

---
 .../Difficulty/Rulesets/Keys/DifficultyProcessorKeys.cs       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Quaver.API/Maps/Processors/Difficulty/Rulesets/Keys/DifficultyProcessorKeys.cs b/Quaver.API/Maps/Processors/Difficulty/Rulesets/Keys/DifficultyProcessorKeys.cs
index 467eb6739..932c6137d 100644
--- a/Quaver.API/Maps/Processors/Difficulty/Rulesets/Keys/DifficultyProcessorKeys.cs
+++ b/Quaver.API/Maps/Processors/Difficulty/Rulesets/Keys/DifficultyProcessorKeys.cs
@@ -541,6 +541,10 @@ private void ComputeForPatternFlags()
         /// <returns></returns>
         private float CalculateOverallDifficulty()
         {
+            // When the map has only scratch key notes, StrainSolverData would be empty, so we return 0
+            if (StrainSolverData.Count == 0)
+                return 0;
+
             float calculatedDiff;
 
             // Solve strain value of every data point