Fix TypeError on metrics-enabled: false #54

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@@ -13,7 +13,7 @@ function main(config) {
worlds = [],
lastTotalPlayers = 0,
checkPopulationInterval = setInterval(function() {
- if(metrics.isReady) {
+ if(metrics && metrics.isReady) {
metrics.getTotalPlayers(function(totalPlayers) {
if(totalPlayers !== lastTotalPlayers) {
lastTotalPlayers = totalPlayers;