Update src/Avalonia.Controls/AutoCompleteBox.cs

5 years ago · b6650a8e4b
1 changed files with 1 additions and 1 deletions
--- a/src/Avalonia.Controls/AutoCompleteBox.cs
+++ b/src/Avalonia.Controls/AutoCompleteBox.cs
@ -2100,7 +2100,7 @@ namespace Avalonia.Controls
                    }
                    else
                    {
-                        if (ItemFilter == null)
+                        if (ItemFilter is null)
                        {
                            throw new Exception("ItemFilter property can not be null when FilterMode has value AutoCompleteFilterMode.Custom");
                        }