hotfix/critical exists handle NaN

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dayzr-bot",
-  "version": "12.1.7",
+  "version": "12.1.8",
   "description": "A General Purpose Discord Bot for DayZ Nitrado Servers.",
   "main": "index.js",
   "nodemonConfig": {

src/DayzRBot.js

@@ -346,7 +346,7 @@ class DayzRBot extends Client {
     }
   }
 
-  exists(n) { return null != n && undefined != n && "" != n && !isNaN(n) }
+  exists(n) { return typeof(n) == 'number' ? !isNaN(n) : null != n && undefined != n && "" != n }
   
   secondsToDhms(seconds) {
     seconds = Number(seconds);