apps/admin-ui/src/components/ProductForm.tsx

@@ -212,15 +212,20 @@ const ProductForm = forwardRef<ProductFormRef, ProductFormProps>(({
         // 'quantity' feature must always go out lowercase (case-insensitive
         // matching means 'Quantity'/'QUANTITY' are treated the same), and
         // names are trimmed like the backend does.
+        // TextInputs emit strings — coerce price fields to the numeric types
+        // the backend zod schema requires (price required; market/flash nullable).
+        const toNumber = (value: unknown): number | null => {
+          if (value == null || value === '') return null
+          const n = Number(value)
+          return Number.isFinite(n) ? n : null
+        }
         const normalizedValues: ProductFormData = {
           ...values,
           variants: values.variants.map((v) => ({
             ...v,
-            // TextInputs emit strings — coerce to the numeric types the
-            // backend zod schema requires (price required; market/flash nullable).
-            price: v.price == null || v.price === '' ? undefined : Number(v.price),
-            marketPrice: v.marketPrice == null || v.marketPrice === '' ? null : Number(v.marketPrice),
-            flashPrice: v.flashPrice == null || v.flashPrice === '' ? null : Number(v.flashPrice),
+            price: toNumber(v.price) ?? undefined,
+            marketPrice: toNumber(v.marketPrice),
+            flashPrice: toNumber(v.flashPrice),
             features: v.features.map((a) => ({
               ...a,
               featureName: isQuantityFeature(a) ? 'quantity' : (a.featureName ?? '').trim() || null,