diff --git a/apps/client/src/services/css_class_manager.ts b/apps/client/src/services/css_class_manager.ts
index 9c6a97aaf..510a044d6 100644
--- a/apps/client/src/services/css_class_manager.ts
+++ b/apps/client/src/services/css_class_manager.ts
@@ -39,7 +39,7 @@ function createClassForColor(colorString: string | null) {
         </style>`);
 
         registeredClasses.add(className);
-        if (hue) {
+        if (hue !== undefined) {
             colorsWithHue.add(className);
         }
     }