fix #getNextProtocolVersion crash from Bedrock having undefined versions

lib/servers.js

@@ -249,6 +249,13 @@ class ServerRegistration {
   }
 
   getNextProtocolVersion () {
+    // Minecraft Bedrock Edition does not have protocol versions
+    if (this.data.type === 'PE') {
+      return {
+        protocolId: 0,
+        protocolIndex: 0
+      }
+    }
     const protocolVersions = minecraftVersions[this.data.type]
     if (typeof this._nextProtocolIndex === 'undefined' || this._nextProtocolIndex + 1 >= protocolVersions.length) {
       this._nextProtocolIndex = 0