Fix Bug

commands/random/mathgame.js

@@ -42,7 +42,7 @@ class MathGameCommand extends commando.Command {
         let randomValue2 = Math.floor(Math.random() * randomValue) + 1;
         let randomExpression = randomValue1 + randomType + randomValue2;
         let solved = math.eval(randomExpression);
-        if(time === undefined) {
+        if(randomValue === undefined) {
             message.channel.sendMessage(':x: Error! No difficulty set! (Choose Easy, Medium, Hard, or Extreme)');
         } else {
             const embed = new Discord.RichEmbed()