diff --git a/app/web/src/components/Customizer/Customizer.tsx b/app/web/src/components/Customizer/Customizer.tsx
index 8ff5654..6481738 100644
--- a/app/web/src/components/Customizer/Customizer.tsx
+++ b/app/web/src/components/Customizer/Customizer.tsx
@@ -304,7 +304,7 @@ function NumberParam({
     if (typeof param.max === 'number') {
       num = Math.min(param.max, num)
     }
-    num = Number(num.toFixed(2))
+    num = Number((num || 0).toFixed(2))
     localValueSetter(num)
     onChange(num)
   }
diff --git a/app/web/src/helpers/cadPackages/cadQuery/cadQueryParams.ts b/app/web/src/helpers/cadPackages/cadQuery/cadQueryParams.ts
index 4df9492..8371b95 100644
--- a/app/web/src/helpers/cadPackages/cadQuery/cadQueryParams.ts
+++ b/app/web/src/helpers/cadPackages/cadQuery/cadQueryParams.ts
@@ -41,21 +41,21 @@ export function CadQueryToCadhubParams(
             type: 'number',
             input: 'default-number',
             ...common,
-            initial: param.initial,
+            initial: param.initial || 0,
           }
         case 'string':
           return {
             type: 'string',
             input: 'default-string',
             ...common,
-            initial: param.initial,
+            initial: param.initial || '',
           }
         case 'boolean':
           return {
             type: 'boolean',
             input: 'default-boolean',
             ...common,
-            initial: param.initial,
+            initial: param.initial || false,
           }
       }
     })