diff --git a/src/Lucene.Net/Support/Threading/AtomicDouble.cs b/src/Lucene.Net/Support/Threading/AtomicDouble.cs
index 62225e7ab9..20e5f1aa4b 100644
--- a/src/Lucene.Net/Support/Threading/AtomicDouble.cs
+++ b/src/Lucene.Net/Support/Threading/AtomicDouble.cs
@@ -364,7 +364,7 @@ public static implicit operator double(AtomicDouble atomicInt64)
             if (a2 is null)
                 return false;
 
-            return a1.Equals(a2.Value);
+            return a2.Equals(a1);
         }
 
         /// <summary>
@@ -411,10 +411,12 @@ public static implicit operator double(AtomicDouble atomicInt64)
         /// <returns><c>true</c> if the given numbers are equal; otherwise, <c>false</c>.</returns>
         public static bool operator ==(double? a1, AtomicDouble? a2)
         {
-            if (!a1.HasValue)
+            if (a1 is null)
                 return a2 is null;
+            if (a2 is null)
+                return false;
 
-            return a1.GetValueOrDefault().Equals(a2.Value);
+            return a2.Equals(a1.Value);
         }
 
         /// <summary>