diff --git a/src-electron/generator/matter/darwin/Framework/CHIP/templates/helper.js b/src-electron/generator/matter/darwin/Framework/CHIP/templates/helper.js
index 162e3be7f2..c2b557c9d6 100644
--- a/src-electron/generator/matter/darwin/Framework/CHIP/templates/helper.js
+++ b/src-electron/generator/matter/darwin/Framework/CHIP/templates/helper.js
@@ -110,14 +110,15 @@ function asObjectiveCNumberType(label, type, asLowerCased) {
             return 'Float';
           case 'double':
             return 'Double';
-          default:
-            error =
+          default: {
+            let error =
               label +
               ': Unhandled underlying type ' +
               zclType +
               ' for original type ' +
               type;
             throw error;
+          }
         }
       })
       .then((typeName) =>