Prevent TypeError when removing event lPrevent TypeError when removing event listeners in switchWorld (BunJS issue maybe)isteners in switchWorld (#3544)

Added a check to ensure that only valid function listeners are removed using bot.off

Author: 0x15d2

lib/plugins/blocks.js

@@ -511,7 +511,7 @@ function inject (bot, { version, storageBuilder, hideErrors }) {
       }
 
       for (const [name, listener] of Object.entries(bot._events)) {
-        if (name.startsWith('blockUpdate:')) {
+        if (name.startsWith('blockUpdate:') && typeof listener === 'function') {
           bot.emit(name, null, null)
           bot.off(name, listener)
         }