diff --git a/light9/web/floating_color_picker.ts b/light9/web/floating_color_picker.ts
--- a/light9/web/floating_color_picker.ts
+++ b/light9/web/floating_color_picker.ts
@@ -82,6 +82,11 @@ class RainbowCanvas {
       throw new Error("no match");
     }
 
+    log("col", col);
+    if (col == "#ffffff") {
+      return new RainbowCoord(400 / 2, 0);
+    }
+
     let bright = color(col).value(1).hex();
     let r = parseInt(bright.slice(1, 3), 16),
       g = parseInt(bright.slice(3, 5), 16),