diff --git a/src/Microsoft.AspNetCore.JsonPatch/Adapters/AdapterFactory.cs b/src/Microsoft.AspNetCore.JsonPatch/Adapters/AdapterFactory.cs
index c963fcffdd..82aaa56a70 100644
--- a/src/Microsoft.AspNetCore.JsonPatch/Adapters/AdapterFactory.cs
+++ b/src/Microsoft.AspNetCore.JsonPatch/Adapters/AdapterFactory.cs
@@ -15,6 +15,16 @@ namespace Microsoft.AspNetCore.JsonPatch.Adapters
         /// <inheritdoc />
         public virtual IAdapter Create(object target, IContractResolver contractResolver)
         {
+            if (target == null)
+            {
+                throw new ArgumentNullException(nameof(target));
+            }
+
+            if (contractResolver == null)
+            {
+                throw new ArgumentNullException(nameof(contractResolver));
+            }
+
             var jsonContract = contractResolver.ResolveContract(target.GetType());
 
             if (target is IList)
diff --git a/src/Microsoft.AspNetCore.JsonPatch/Adapters/ObjectAdapter.cs b/src/Microsoft.AspNetCore.JsonPatch/Adapters/ObjectAdapter.cs
index 48d7e69b0f..d625176376 100644
--- a/src/Microsoft.AspNetCore.JsonPatch/Adapters/ObjectAdapter.cs
+++ b/src/Microsoft.AspNetCore.JsonPatch/Adapters/ObjectAdapter.cs
@@ -47,7 +47,7 @@ namespace Microsoft.AspNetCore.JsonPatch.Adapters
         /// <summary>
         /// Gets or sets the <see cref="IAdapterFactory"/>
         /// </summary>
-        public IAdapterFactory AdapterFactory { get; set; }
+        public IAdapterFactory AdapterFactory { get; }
 
         /// <summary>
         /// Action for logging <see cref="JsonPatchError"/>.