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Created by Jingyuan Ma@majingyuan2000

[Bug Report] NullPointerException when leaving a dungeon

Sometimes will get this error when leaving a dungeon

[16:50:21 WARN]: [MythicDungeons] Plugin MythicDungeons v1.0.2 generated an exception while executing task 57293
java.lang.NullPointerException: Nodes must be provided.
        at org.yaml.snakeyaml.nodes.NodeTuple.<init>(NodeTuple.java:28) ~[snakeyaml-1.30.jar:?]
        at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:164) ~[snakeyaml-1.30.jar:?]
        at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:321) ~[snakeyaml-1.30.jar:?]
        at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSerializable.representData(YamlRepresenter.java:42) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:95) ~[snakeyaml-1.30.jar:?]
        at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresenter.java:65) ~[snakeyaml-1.30.jar:?]
        at org.bukkit.configuration.file.YamlConfiguration.toNodeTree(YamlConfiguration.java:190) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConfiguration.java:78) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:65) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at net.playavalon.mythicdungeons.dungeons.Dungeon.lambda$savePlayerData$7(Dungeon.java:659) ~[MythicDungeons-1.0.2.jar:?]
        at org.bukkit.craftbukkit.v1_18_R2.scheduler.CraftTask.run(CraftTask.java:101) ~[paper-1.18.2.jar:git-Paper-379]
        at org.bukkit.craftbukkit.v1_18_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57) ~[paper-1.18.2.jar:git-Paper-379]
        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[paper-1.18.2.jar:git-Paper-379]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]