diff --git a/lib/api/model/model.dart b/lib/api/model/model.dart
index 5fef1fefea..1b4aef45ce 100644
--- a/lib/api/model/model.dart
+++ b/lib/api/model/model.dart
@@ -494,7 +494,7 @@ ColorSwatch<StreamColor> streamColorSwatch(int base) {
     // TODO fix bug where our results differ from the replit's (see unit tests)
     StreamColor.iconOnBarBackground:
       clamped20to75AsHsl
-        .withLightness(clamped20to75AsHsl.lightness - 0.12)
+        .withLightness((clamped20to75AsHsl.lightness - 0.12).clamp(0.0, 1.0))
         .toColor(),
 
     // Follows `.recepient` in Vlad's replit: