after match sidebar is bugging and take this error

[yusif198]

[13:12:07 WARN]: [BedWars1058] Task #48 for BedWars1058 v24.9 generated an exception
java.lang.NullPointerException: null
at com.andrei1058.bedwars.sidebar.SidebarService.lambda$refreshHealth$12(SidebarService.java:290) ~[?:?]
at java.util.HashMap.forEach(HashMap.java:1337) ~[?:?]
at com.andrei1058.bedwars.sidebar.SidebarService.refreshHealth(SidebarService.java:287) ~[?:?]
at com.andrei1058.bedwars.sidebar.thread.RefreshLifeTask.run(RefreshLifeTask.java:28) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59) ~[patched_1.8.8.jar:git-PaperSpigot-445]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352) [patched_1.8.8.jar:git-PaperSpigot-445]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:783) [patched_1.8.8.jar:git-PaperSpigot-445]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [patched_1.8.8.jar:git-PaperSpigot-445]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [patched_1.8.8.jar:git-PaperSpigot-445]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [patched_1.8.8.jar:git-PaperSpigot-445]
at java.lang.Thread.run(Thread.java:829) [?:?]

this bug just happening on op players