fix

YGOProMessages.js

@@ -146,7 +146,6 @@ class YGOProMessagesHelper {
         }
         let { direction, proto } = this.getDirectionAndProto(protostr);
         synchronous = synchronous || false;
-        priority = priority || 1;
         const handlerObj = new Handler(handler, synchronous);
         let handlerCollection = this.handlers[direction][priority];
         const translatedProto = this.translateProto(proto, direction);

YGOProMessages.ts

@@ -181,7 +181,6 @@ export class YGOProMessagesHelper {
 			proto
 		} = this.getDirectionAndProto(protostr);
 		synchronous = synchronous || false;
-		priority = priority || 1;
 		const handlerObj = new Handler(handler, synchronous);
 		let handlerCollection: Map<number, Handler[]> = this.handlers[direction][priority];
 		const translatedProto = this.translateProto(proto, direction);