diff --git a/frontend/src/component/feature/FeatureView/FeatureVariants/FeatureEnvironmentVariants/EnvironmentVariantsModal/VariantForm/VariantForm.tsx b/frontend/src/component/feature/FeatureView/FeatureVariants/FeatureEnvironmentVariants/EnvironmentVariantsModal/VariantForm/VariantForm.tsx
index fea165e547..3a61919c17 100644
--- a/frontend/src/component/feature/FeatureView/FeatureVariants/FeatureEnvironmentVariants/EnvironmentVariantsModal/VariantForm/VariantForm.tsx
+++ b/frontend/src/component/feature/FeatureView/FeatureVariants/FeatureEnvironmentVariants/EnvironmentVariantsModal/VariantForm/VariantForm.tsx
@@ -262,7 +262,10 @@ export const VariantForm = ({
 
     const validatePayload = (payload: IPayload) => {
         if (!isValidPayload(payload)) {
-            setError(ErrorField.PAYLOAD, 'Invalid JSON.');
+            setError(
+                ErrorField.PAYLOAD,
+                payload.type === 'json' ? 'Invalid json' : 'Invalid number'
+            );
         }
     };
 
@@ -293,7 +296,7 @@ export const VariantForm = ({
                 JSON.parse(payload.value);
             }
             if (variantTypeNumber && payload.type === 'number') {
-                Number(payload.value);
+                return !Number.isNaN(Number(payload.value));
             }
             return true;
         } catch (e: unknown) {