diff --git a/www/js/fly-ws.js b/www/js/fly-ws.js
index 0135fc1..d2c84ef 100644
--- a/www/js/fly-ws.js
+++ b/www/js/fly-ws.js
@@ -92,6 +92,18 @@ class FLYSocket {
         // s: DataStream
     }
 
+    handle_packet255(data) {
+        // Hxs
+        // H: Length
+        // s: ErrorMessage
+        let ret = "";
+        let length = data.getUint16(this.pointer); this.pointer += 2;
+        for (let i = 0; i < length; i++) {
+            ret += String.fromCharCode( data.getUint8(this.pointer++) );
+        }
+        return ret;
+    }
+
     handle_packetInvalid(data) {
         throw TypeError(`Invalid DATA: ${Array.from( this.buffer2HexArray(data, --this.pointer) ).join(" ")}`);
     }