diff --git a/src/client/types/number.type-renderer.jsx b/src/client/types/number.type-renderer.jsx
index c465db6..c11594c 100644
--- a/src/client/types/number.type-renderer.jsx
+++ b/src/client/types/number.type-renderer.jsx
@@ -19,7 +19,7 @@ const Number = ({
         ? (
           <select readOnly value={value}>
             {Object.entries(options).map(([optionValue, optionLabel]) => (
-              <option value={optionValue}>{optionLabel}</option>
+              <option key={optionValue}>{optionLabel}</option>
             ))}
           </select>
         )