diff --git a/curriculum/challenges/english/25-front-end-development/workshop-storytelling-app/671fafbae959c048d82bac8d.md b/curriculum/challenges/english/25-front-end-development/workshop-storytelling-app/671fafbae959c048d82bac8d.md
index 4b1e2aa15fd..700fc9daabc 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-storytelling-app/671fafbae959c048d82bac8d.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-storytelling-app/671fafbae959c048d82bac8d.md
@@ -23,7 +23,7 @@ function rgbToHex(rgb) {
   return (
     "#" +
     rgbValues
-      .map((num) => parseInt(num).toString(16).padStart(2, "0"))
+      ?.map((num) => parseInt(num).toString(16).padStart(2, "0"))
       .join("")
   );
 }
@@ -46,7 +46,7 @@ function rgbToHex(rgb) {
   return (
     "#" +
     rgbValues
-      .map((num) => parseInt(num).toString(16).padStart(2, "0"))
+      ?.map((num) => parseInt(num).toString(16).padStart(2, "0"))
       .join("")
   );
 }
@@ -69,7 +69,7 @@ function rgbToHex(rgb) {
   return (
     "#" +
     rgbValues
-      .map((num) => parseInt(num).toString(16).padStart(2, "0"))
+      ?.map((num) => parseInt(num).toString(16).padStart(2, "0"))
       .join("")
   );
 }