diff --git a/i18n/en.json b/i18n/en.json
index af9ac7a..0de7d88 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -39,6 +39,8 @@
 	"liquipediamediawikimessages-column-delete": "Delete",
 
 	"apihelp-updatelpmwmessageapi-summary": "API Helper to update LiquipediaMediaWikiMessages message values",
+	"liquipediamediawikimessages-api-error-missing-messagename": "Missing parameter 'messagename'. It should be passed via POST",
+	"liquipediamediawikimessages-api-error-missing-value": "Missing parameter 'value'. It should be passed via POST",
 	"liquipediamediawikimessages-api-message-name": "Message name to update the value for",
 	"liquipediamediawikimessages-api-message-value": "Value for the particular message defined before",
 	"liquipediamediawikimessages-api-example": "Example:",
diff --git a/src/Api/UpdateMessageApiModule.php b/src/Api/UpdateMessageApiModule.php
index 02e31ba..c0d7d21 100644
--- a/src/Api/UpdateMessageApiModule.php
+++ b/src/Api/UpdateMessageApiModule.php
@@ -14,6 +14,18 @@ class UpdateMessageApiModule extends ApiBase {
 	 */
 	public function execute() {
 		$postValues = $this->getRequest()->getPostValues();
+		if ( !array_key_exists( 'messagename', $postValues ) ) {
+			$this->getResult()->addValue( null, $this->getModuleName(), [
+				'message' => $this->msg( 'liquipediamediawikimessages-api-error-missing-messagename' )
+			] );
+			return;
+		}
+		if ( !array_key_exists( 'value', $postValues ) ) {
+			$this->getResult()->addValue( null, $this->getModuleName(), [
+				'message' => $this->msg( 'liquipediamediawikimessages-api-error-missing-value' )
+			] );
+			return;
+		}
 		$messageName = $postValues[ 'messagename' ];
 		$value = $postValues[ 'value' ];