Full crash report:
A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Stacktrace:
at com.flansmod.common.driveables.EntityDriveable.hasEnoughFuel(EntityDriveable.java:1969)
at com.flansmod.common.driveables.EntityDriveable.func_70071_h_(EntityDriveable.java:1258)
at com.flansmod.common.driveables.EntityPlane.func_70071_h_(EntityPlane.java:429)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
at net.minecraft.world.World.func_72870_g(World.java:2034)

-- Entity being ticked --
Details:
Entity Type: Plane (com.flansmod.common.driveables.EntityPlane)
Entity ID: 20252
Entity Name: Sikorsky HO3S-1 Dragonfly
Entity's Exact location: -1393.50, 10.13, 1158.50
Entity's Block location: World: (-1394,10,1158), Chunk: (at 14,0,6 in -88,72; contains blocks -1408,0,1152 to -1393,255,1167), Region: (-3,2; contains chunks -96,64 to -65,95, blocks -1536,0,1024 to -1025,255,1535)
Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

-- Affected level --
Details:
Level name: New World
All players: 1 total; [​EntityPlayerMP['AGSlayerGaming'/43, l='New World', x=-1393.50, y=3.00, z=1155.50]]
Chunk stats: ServerChunkCache: 674 Drop: 0
Level seed: 2821936489411846480
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 2;2x3,2;1;village
Level spawn location: World: (-1390,4,1153), Chunk: (at 2,0,1 in -87,72; contains blocks -1392,0,1152 to -1377,255,1167), Region: (-3,2; contains chunks -96,64 to -65,95, blocks -1536,0,1024 to -1025,255,1535)
Level time: 432 game time, 432 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 42648 (now: false), thunder time: 153011 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
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: Mac OS X (x86_64) version 10.15.6
Java Version: 1.8.0_74, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 582304848 bytes (555 MB) / 1472200704 bytes (1404 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 2 total; -Xmx4096m -Xms256m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 5 mods loaded, 5 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [​Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{7.10.99.99} [​Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1614} [​Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA flansmod{@VERSION@} [​Flan's Mod Ultimate] (FlansModPlusUltimate1.1-1.7.10.jar)
UCHIJAAAA worldedit{6.1.1} [​WorldEdit] (worldedit-forge-mc1.7.10-6.1.1-dist.jar)
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [​EntityPlayerMP['AGSlayerGaming'/43, l='New World', x=-1393.50, y=3.00, z=1155.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'