diff --git a/class-auth.php b/class-auth.php
index 3ec988d..87bc6a9 100644
--- a/class-auth.php
+++ b/class-auth.php
@@ -372,6 +372,10 @@ public function is_error_response( $response ) {
 	 * @return WP_REST_Response | Array Returns WP_REST_Response or token's $payload.
 	 */
 	public function validate_token( $return_response = true ) {
+		global $l10n;
+
+		$has_l10n = isset( $l10n[ 'jwt-auth' ] );
+
 		/**
 		 * Looking for the HTTP_AUTHORIZATION header, if not present just
 		 * return the user.
@@ -390,7 +394,7 @@ public function validate_token( $return_response = true ) {
 					'success'    => false,
 					'statusCode' => 401,
 					'code'       => 'jwt_auth_no_auth_header',
-					'message'    => __( 'Authorization header not found.', 'jwt-auth' ),
+					'message'    => $has_l10n ? __( 'Authorization header not found.', 'jwt-auth' ) : 'Authorization header not found.',
 					'data'       => array(),
 				),
 				401
@@ -409,7 +413,7 @@ public function validate_token( $return_response = true ) {
 					'success'    => false,
 					'statusCode' => 401,
 					'code'       => 'jwt_auth_bad_auth_header',
-					'message'    => __( 'Authorization header malformed.', 'jwt-auth' ),
+					'message'    => $has_l10n ? __( 'Authorization header malformed.', 'jwt-auth' ) : 'Authorization header malformed.',
 					'data'       => array(),
 				),
 				401
@@ -425,7 +429,7 @@ public function validate_token( $return_response = true ) {
 					'success'    => false,
 					'statusCode' => 401,
 					'code'       => 'jwt_auth_bad_config',
-					'message'    => __( 'JWT is not configured properly.', 'jwt-auth' ),
+					'message'    => $has_l10n ? __( 'JWT is not configured properly.', 'jwt-auth' ) : 'JWT is not configured properly.',
 					'data'       => array(),
 				),
 				401
@@ -445,7 +449,7 @@ public function validate_token( $return_response = true ) {
 						'success'    => false,
 						'statusCode' => 401,
 						'code'       => 'jwt_auth_bad_iss',
-						'message'    => __( 'The iss do not match with this server.', 'jwt-auth' ),
+						'message'    => $has_l10n ? __( 'The iss do not match with this server.', 'jwt-auth' ) : 'The iss do not match with this server.',
 						'data'       => array(),
 					),
 					401
@@ -460,7 +464,7 @@ public function validate_token( $return_response = true ) {
 						'success'    => false,
 						'statusCode' => 401,
 						'code'       => 'jwt_auth_bad_request',
-						'message'    => __( 'User ID not found in the token.', 'jwt-auth' ),
+						'message'    => $has_l10n ? __( 'User ID not found in the token.', 'jwt-auth' ) : 'User ID not found in the token.',
 						'data'       => array(),
 					),
 					401
@@ -477,7 +481,7 @@ public function validate_token( $return_response = true ) {
 						'success'    => false,
 						'statusCode' => 401,
 						'code'       => 'jwt_auth_invalid_token',
-						'message'    => __( "Invalid token", 'jwt-auth' ),
+						'message'    => $has_l10n ? __( "Invalid token", 'jwt-auth' ) : "Invalid token",
 						'data'       => array(),
 					),
 					401
@@ -494,7 +498,7 @@ public function validate_token( $return_response = true ) {
 						'success'    => false,
 						'statusCode' => 401,
 						'code'       => 'jwt_auth_obsolete_token',
-						'message'    => __( 'Token is obsolete', 'jwt-auth' ),
+						'message'    => $has_l10n ? __( 'Token is obsolete', 'jwt-auth' ) : 'Token is obsolete',
 						'data'       => array(),
 					),
 					401
@@ -510,7 +514,7 @@ public function validate_token( $return_response = true ) {
 				'success'    => true,
 				'statusCode' => 200,
 				'code'       => 'jwt_auth_valid_token',
-				'message'    => __( 'Token is valid', 'jwt-auth' ),
+				'message'    => $has_l10n ? __( 'Token is valid', 'jwt-auth' ) : 'Token is valid',
 				'data'       => array(),
 			);
 
diff --git a/readme.txt b/readme.txt
index 55ef295..0d5b7d2 100644
--- a/readme.txt
+++ b/readme.txt
@@ -816,6 +816,7 @@ You can help this plugin stay alive and maintained by giving **5 Stars** Rating/
 
 == Changelog ==
 = 3.0.x =
+- Fix: String translation is invoked before gettext domain is loaded.
 - Fix: Prioritise authentication with user credentials over refresh token if both are sent.
 
 = 3.0.2 =