diff --git a/modules/field/modules/number/number.module b/modules/field/modules/number/number.module
index fd53673..249370e 100644
--- a/modules/field/modules/number/number.module
+++ b/modules/field/modules/number/number.module
@@ -135,6 +135,12 @@ function number_field_instance_settings_form($field, $instance) {
 function number_field_validate($entity_type, $entity, $field, $instance, $langcode, $items, &$errors) {
   foreach ($items as $delta => $item) {
     if ($item['value'] != '') {
+      if (!is_numeric($item['value'])) {
+        $errors[$field['field_name']][$langcode][$delta][] = array(
+          'error' => 'not_numeric',
+          'message' => t('%name: Is not a valid number', array('%name' => $instance['label'])),
+        );
+      }
       if (is_numeric($instance['settings']['min']) && $item['value'] < $instance['settings']['min']) {
         $errors[$field['field_name']][$langcode][$delta][] = array(
           'error' => 'number_min',