diff --git a/sdk/appconfiguration/Azure.Data.AppConfiguration/src/ConfigurationClient.cs b/sdk/appconfiguration/Azure.Data.AppConfiguration/src/ConfigurationClient.cs
index 3019f16ae2f1..4fc46b249f16 100644
--- a/sdk/appconfiguration/Azure.Data.AppConfiguration/src/ConfigurationClient.cs
+++ b/sdk/appconfiguration/Azure.Data.AppConfiguration/src/ConfigurationClient.cs
@@ -626,6 +626,7 @@ internal virtual Response<ConfigurationSetting> Get(string key, string label, Da
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
         public virtual AsyncPageable<ConfigurationSetting> GetSettingsAsync(SettingSelector selector, CancellationToken cancellationToken = default)
         {
+            Argument.AssertNotNull(selector, nameof(selector));
             return PageResponseEnumerator.CreateAsyncEnumerable(nextLink => GetSettingsPageAsync(selector, nextLink, cancellationToken));
         }
 
@@ -636,6 +637,7 @@ public virtual AsyncPageable<ConfigurationSetting> GetSettingsAsync(SettingSelec
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
         public virtual Pageable<ConfigurationSetting> GetSettings(SettingSelector selector, CancellationToken cancellationToken = default)
         {
+            Argument.AssertNotNull(selector, nameof(selector));
             return PageResponseEnumerator.CreateEnumerable(nextLink => GetSettingsPage(selector, nextLink, cancellationToken));
         }
 
@@ -646,6 +648,7 @@ public virtual Pageable<ConfigurationSetting> GetSettings(SettingSelector select
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
         public virtual AsyncPageable<ConfigurationSetting> GetRevisionsAsync(SettingSelector selector, CancellationToken cancellationToken = default)
         {
+            Argument.AssertNotNull(selector, nameof(selector));
             return PageResponseEnumerator.CreateAsyncEnumerable(nextLink => GetRevisionsPageAsync(selector, nextLink, cancellationToken));
         }
 
@@ -656,6 +659,7 @@ public virtual AsyncPageable<ConfigurationSetting> GetRevisionsAsync(SettingSele
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
         public virtual Pageable<ConfigurationSetting> GetRevisions(SettingSelector selector, CancellationToken cancellationToken = default)
         {
+            Argument.AssertNotNull(selector, nameof(selector));
             return PageResponseEnumerator.CreateEnumerable(nextLink => GetRevisionsPage(selector, nextLink, cancellationToken));
         }