Ultimate stacker colliding with Mythic

[05:05:09 WARN]: [UltimateStacker] Task #1748388 for UltimateStacker v2.1.7 generated an exception java.lang.NullPointerException: Cannot invoke "io.lumine.xikage.mythicmobs.skills.placeholders.parsers.PlaceholderString.toString()" because the return value of "io.lumine.xikage.mythicmobs.mobs.MythicMob.getDisplayName()" is null at com.songoda.ultimatestacker.stackable.entity.custom.entities.MythicMobsCustomEntity.getDisplayName(MythicMobsCustomEntity.java:31) ~[?:?] at com.songoda.ultimatestacker.utils.Methods.compileEntityName(Methods.java:125[2582.schematic] at com.songoda.ultimatestacker.stackable.entity.EntityStack.lambda$updateStack$0(EntityStack.java:74) ~[?:?] at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:101) ~[patched_1.16.5.jar:git-Paper-788] at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:485) ~[patched_1.16.5.jar:git-Paper-788] at net.minecraft.server.v1_16_R3.MinecraftServer.b(MinecraftServer.java:1427) ~[patched_1.16.5.jar:git-Paper-788] at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:436) ~[patched_1.16.5.jar:git-Paper-788] at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1342) ~[patched_1.16.5.jar:git-Paper-788] at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1130) ~[patched_1.16.5.jar:git-Paper-788] at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:291) ~[patched_1.16.5.jar:git-Paper-788] at java.lang.Thread.run(Thread.java:831) [?:?] I dont know what the issue may be, im new to this.