diff --git a/src/schema/_scalar/ScalarResult.php b/src/schema/_scalar/ScalarResult.php
index 6e50a29..44f07b9 100644
--- a/src/schema/_scalar/ScalarResult.php
+++ b/src/schema/_scalar/ScalarResult.php
@@ -51,7 +51,12 @@ class ScalarResult extends Result {
     $this->result[$name] = $value;
   }
 
-  function setMissing(ScalarSchema $schema, ?string $key=null): int {
+  protected static function replace_key(string &$message, ?string $key): void {
+    if ($key) $message = str_replace("{key}", $key, $message);
+    else $message = str_replace("{key}: ", "", $message);
+  }
+
+  function setMissing(ScalarSchema $schema): int {
     $this->missing = true;
     if (!$schema->required) {
       $this->null = true;
@@ -60,13 +65,13 @@ class ScalarResult extends Result {
       return ref_analyze::NORMALIZED;
     } else {
       $message = cl::get($schema->messages, "missing");
-      $message = str_replace("{key}", $key, $message);
+      self::replace_key($message, $schema->name);
       $this->message = $message;
       return ref_analyze::MISSING;
     }
   }
 
-  function setNull(ScalarSchema $schema, ?string $key=null): int {
+  function setNull(ScalarSchema $schema): int {
     $this->missing = true;
     if ($schema->nullable) {
       $this->valid = true;
@@ -74,7 +79,7 @@ class ScalarResult extends Result {
       return ref_analyze::NORMALIZED;
     } else {
       $message = cl::get($schema->messages, "null");
-      $message = str_replace("{key}", $key, $message);
+      self::replace_key($message, $schema->name);
       $this->message = $message;
       return ref_analyze::NULL;
     }
diff --git a/src/schema/_scalar/ScalarValue.php b/src/schema/_scalar/ScalarValue.php
index b69b64e..c35d746 100644
--- a/src/schema/_scalar/ScalarValue.php
+++ b/src/schema/_scalar/ScalarValue.php
@@ -60,10 +60,10 @@ class ScalarValue extends Value {
     $destKey = $this->destKey;
     $result = $this->result;
     $result->reset();
-    if (!$input->available()) return $result->setMissing($schema, $destKey);
-    $value = $input->get($destKey);
-    if ($value === null) return $result->setNull($schema, $destKey);
     #XXX résoudre le type
+    if (!$input->available()) return $result->setMissing($schema);
+    $value = $input->get($destKey);
+    if ($value === null) return $result->setNull($schema);
   }
 
   function exists(): bool {