[18:00:37] [Craft Scheduler Thread - 1063/WARN]: org.apache.commons.lang.UnhandledException: Plugin OnlineTimeLogger v2.2 generated an exception while executing task 30
    at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: Nodes must be provided.
    at org.yaml.snakeyaml.nodes.NodeTuple.<init>(NodeTuple.java:28)
    at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:163)
    at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)
    at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)
    at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresenter.java:64)
    at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:242)
    at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:206)
    at org.yaml.snakeyaml.Yaml.dump(Yaml.java:181)
    at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConfiguration.java:40)
    at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:103)
    at org.bukkit.plugin.java.JavaPlugin.saveConfig(JavaPlugin.java:230)
    at me.RyanWild.OnlineTimeLogger.OnlineTimeLogger$1.run(OnlineTimeLogger.java:92)
    at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
    at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
    ... 3 more