Fixed database errors if players were online during server reload

src/main/java/com/planetgallium/kitpvp/Game.java

@@ -87,10 +87,22 @@ public class Game extends JavaPlugin implements Listener {
 			hasWorldGuard = true;
 		}
 
+		populateUUIDCacheForOnlinePlayers();
+
 		Toolkit.printToConsole("&7[&b&lKIT-PVP&7] &aDone!");
 		
 	}
 
+	private void populateUUIDCacheForOnlinePlayers() {
+		// populates UUID cache if there are players online when doing /reload to avoid a lot of errors related
+		// to database and UUIDs
+		if (Bukkit.getOnlinePlayers().size() > 0) {
+			for (Player player : Bukkit.getOnlinePlayers()) {
+				CacheManager.getUUIDCache().put(player.getName(), player.getUniqueId().toString());
+			}
+		}
+	}
+
 	private void checkUpdate() {
 		Updater.of(this).resourceId(27107).handleResponse((versionResponse, version) -> {
 			switch (versionResponse) {