From 77a213b52a9fe320c7741a6da83cdb9a46e54c25 Mon Sep 17 00:00:00 2001
From: lipchev <lipchev@gmail.com>
Date: Sat, 1 May 2021 02:56:54 +0300
Subject: [PATCH] fixing the (possible) concurrent modifications

---
 UnitsNet/CustomCode/UnitValueAbbreviationLookup.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/UnitsNet/CustomCode/UnitValueAbbreviationLookup.cs b/UnitsNet/CustomCode/UnitValueAbbreviationLookup.cs
index a82d3f7faf..b076421848 100644
--- a/UnitsNet/CustomCode/UnitValueAbbreviationLookup.cs
+++ b/UnitsNet/CustomCode/UnitValueAbbreviationLookup.cs
@@ -1,4 +1,4 @@
-// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Licensed under MIT No Attribution, see LICENSE file at the root.
 // Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
 
 using System;
@@ -32,7 +32,7 @@ internal List<string> GetAbbreviationsForUnit<UnitType>(UnitType unit) where Uni
         internal List<string> GetAbbreviationsForUnit(int unit)
         {
             if(!unitToAbbreviationMap.TryGetValue(unit, out var abbreviations))
-                unitToAbbreviationMap[unit] = abbreviations = new List<string>();
+                return new List<string>(0);
 
             return abbreviations.Distinct().ToList();
         }
@@ -44,7 +44,7 @@ internal List<int> GetUnitsForAbbreviation(string abbreviation, bool ignoreCase)
             var map = ignoreCase ? lowerCaseAbbreviationToUnitMap : abbreviationToUnitMap;
 
             if(!map.TryGetValue(key, out List<int> units))
-                map[key] = units = new List<int>();
+                return new List<int>(0);
 
             return units.Distinct().ToList();
         }