diff --git a/LibGit2Sharp/Core/LambdaEqualityHelper.cs b/LibGit2Sharp/Core/LambdaEqualityHelper.cs
index be5bb863d..55ae7bcaf 100644
--- a/LibGit2Sharp/Core/LambdaEqualityHelper.cs
+++ b/LibGit2Sharp/Core/LambdaEqualityHelper.cs
@@ -13,7 +13,7 @@ public LambdaEqualityHelper(params Func<T, object>[] equalityContributorAccessor
 
         public bool Equals(T instance, T other)
         {
-            if (ReferenceEquals(null, other))
+            if (ReferenceEquals(null, instance) || ReferenceEquals(null, other))
             {
                 return false;
             }