> [10:28:06 WARN]: [DailyRewards] Task #132 for DailyRewards v1.1.0 generated an exception
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[?:1.8.0_202]
at java.util.HashMap$KeyIterator.next(HashMap.java:1469) ~[?:1.8.0_202]
at net.archangel99.dailyrewards.manager.RewardGUI$1.run(RewardGUI.java:69) ~[DailyRewards.jar:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:76) ~[server.jar:git-Spigot-e8ded36-acbc348]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:361) [server.jar:git-Spigot-e8ded36-acbc348]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:739) [server.jar:git-Spigot-e8ded36-acbc348]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [server.jar:git-Spigot-e8ded36-acbc348]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [server.jar:git-Spigot-e8ded36-acbc348]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [server.jar:git-Spigot-e8ded36-acbc348]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]