diff --git a/src/PowerShellEditorServices/Extensions/Api/EditorUIService.cs b/src/PowerShellEditorServices/Extensions/Api/EditorUIService.cs
index 4b50e6e41..a62131d2e 100644
--- a/src/PowerShellEditorServices/Extensions/Api/EditorUIService.cs
+++ b/src/PowerShellEditorServices/Extensions/Api/EditorUIService.cs
@@ -168,7 +168,7 @@ public async Task<string> PromptSelectionAsync(string message, IReadOnlyList<Pro
                     Caption = string.Empty,
                     Message = message,
                     Choices = choiceDetails,
-                    DefaultChoices = defaultChoiceIndex > -1 ? new[] { defaultChoiceIndex } : null,
+                    DefaultChoices = defaultChoiceIndex > -1 ? new[] { defaultChoiceIndex } : Array.Empty<int>(),
                 })
                 .Returning<ShowChoicePromptResponse>(CancellationToken.None)
                 .ConfigureAwait(false);