my serverh crashed, halppppppp

so, yea my server crashed, the last time it was working was when I armed a theo nuke to destroy an ai Rhodes bot. Heres da crash log

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 9/21/19 10:41 AM
Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
  at assets.rivalrebels.common.tileentity.TileEntityTheoreticalTsarBomba.func_145845_h(TileEntityTheoreticalTsarBomba.java:256)
  at net.minecraft.world.World.func_72939_s(World.java:1939)
  at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
  at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
  at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
  at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
  at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
  at assets.rivalrebels.common.tileentity.TileEntityTheoreticalTsarBomba.func_145845_h(TileEntityTheoreticalTsarBomba.java:256)

-- Block entity being ticked --
Details:
  Name: rivalrebelstileentity17 // assets.rivalrebels.common.tileentity.TileEntityTheoreticalTsarBomba
  Block type: ID #943 (tile.rivalrebels.blocks.75 // assets.rivalrebels.common.block.trap.BlockTheoreticalTsarBomba)
  Block data value: 4 / 0x4 / 0b0100
  Block location: World: (-421,75,79), Chunk: (at 11,4,15 in -27,4; contains blocks -432,0,64 to -417,255,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
  Actual block type: ID #943 (tile.rivalrebels.blocks.75 // assets.rivalrebels.common.block.trap.BlockTheoreticalTsarBomba)
  Actual block data value: 4 / 0x4 / 0b0100
Stacktrace:
  at net.minecraft.world.World.func_72939_s(World.java:1939)
  at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

-- Affected level --
Details:
  Level name: world
  All players: 1 total; [EntityPlayerMP['elite_mlgbro'/275, l='world', x=-419.49, y=81.93, z=79.26]]
  Chunk stats: ServerChunkCache: 734 Drop: 0
  Level seed: 1468488040426418056
  Level generator: ID 00 - default, ver 1. Features enabled: true
  Level generator options:
  Level spawn location: World: (-532,200,354), Chunk: (at 12,12,2 in -34,22; contains blocks -544,0,352 to -529,255,367), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
  Level time: 6126333 game time, 5340923 day time
  Level dimension: 0
  Level storage version: 0x04ABD - Anvil
  Level weather: Rain time: 51453 (now: false), thunder time: 66026 (now: false)
  Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
  at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
  at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
  at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
  at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- System Details --
Details:
  Minecraft Version: 1.7.10
  Operating System: Windows 10 (x86) version 10.0
  Java Version: 1.8.0_221, Oracle Corporation
  Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
  Memory: 909694104 bytes (867 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
  JVM Flags: 2 total; -Xms1G -Xmx1G
  AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
  IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
  FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 9 mods loaded, 9 mods active
  States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initia

Not 100% sure but i coud be a lack of RAM of your server form what i see you have only 1GB of RAM but you will need more try to allow more like 4 or 5 GB it will probably solve your problem