diff --git a/Source/Engine/UI/GUI/Common/TextBox.cs b/Source/Engine/UI/GUI/Common/TextBox.cs
index 9ee052581..1dfd9facc 100644
--- a/Source/Engine/UI/GUI/Common/TextBox.cs
+++ b/Source/Engine/UI/GUI/Common/TextBox.cs
@@ -301,7 +301,7 @@ namespace FlaxEngine.GUI
             else
             {
                 text = _watermarkText;
-                if (text.Length > 0)
+                if (text?.Length > 0)
                 {
                     Render2D.DrawText(font, _watermarkText, WatermarkTextColor, ref _layout, TextMaterial);
                 }