If I try to close the Engineers Manual by pressing escape, my connection to the server is closed, stating "A fatal error has occurred, this connection is terminated" An error is logged on the server-side, but nothing is logged on client-side.

Open the manual then press escape.
Only reproduceable on multiplayer.

Expected the book to close normally.

Serverside log [ I copied out the relevant part, the entire log was 50k lines.. ]
Server log.txt

Environment

• 1.12.2 Forge Server
• Forge version 14.23.5.2859
• Immersive Intelligence version: 0.2.1
• Immersive Engineering version: 0.12-98
  -Full modlist:
  [✔️] ActuallyAdditions-1.12.2-r152
  [✔️] ae2stuff-0.7.0.4-mc1.12.2
  [✔️] AE2WTLib-1.12.2-1.0.34
  [✔️] AppleSkin-mc1.12-1.0.14
  [✔️] appliedenergistics2-rv6-stable-7
  [✔️] AutoRegLib-1.3-32
  [✔️] Baubles-1.12-1.5.2
  [✔️] baubley-heart-canisters-1.12.2-2.0.3
  [✔️] bdlib-1.14.3.12-mc1.12.2
  [✔️] BetterBuildersWands-1.12-0.11.1.245+69d0d70
  [✔️] bettercaves-1.12.2-2.0.4
  [✔️] BetterFps-1.4.8
  [✔️] BetterMineshaftsForge-1.12.2-2.2.1
  [✔️] BiblioCraft[v2.4.6][MC1.12.2]
  [✔️] Bookshelf-1.12.2-2.3.590
  [✔️] Botania r1.10-364.4
  [✔️] BrandonsCore-1.12.2-2.4.20.162-universal
  [✔️] buildcraft-all-7.99.24.8
  [✔️] cc-tweaked-1.12.2-1.89.2
  [✔️] Chameleon-1.12-4.1.3
  [✔️] ChickenChunks-1.12.2-2.4.2.74-universal
  [✔️] Chisel-MC1.12.2-1.0.2.45
  [✔️] chiselsandbits-14.33
  [✔️] Clumps-3.1.2
  [✔️] CodeChickenLib-1.12.2-3.2.3.358-universal
  [✔️] CoFHCore-1.12.2-4.6.6.1-universal
  [✔️] CoFHWorld-1.12.2-1.4.0.1-universal
  [✔️] CompactSolars-1.12.2-5.0.18.341-universal
  [✔️] Controlling-3.0.10
  [✔️] CosmeticArmorReworked-1.12.2-v5a
  [✔️] CraftTweaker2-1.12-4.1.20.674
  [✔️] crimsonrevelations-0.8
  [✔️] CTM-MC1.12.2-1.0.2.31
  [✔️] DarkUtils-1.12.2-1.8.230
  [✔️] Decocraft-2.6.3.7_1.12.2
  [✔️] deepresonance-1.12-1.8.0
  [✔️] DenseMetals-1.12.2-2.0.0.30
  [✔️] Draconic-Evolution-1.12.2-2.3.28.354-universal
  [✔️] ElecCore-1.12.2-1.9.453
  [✔️] ElevatorMod-1.12.2-1.3.14
  [✔️] EmbersRekindled-1.18
  [✔️] EnderCore-1.12.2-0.5.76
  [✔️] endercrop-1.12.2-1.6.0
  [✔️] EnderIO-1.12.2-5.3.70
  [✔️] EnderIO-conduits-mekanism-1.12.2-5.3.70
  [✔️] EnderStorage-1.12.2-2.4.6.137-universal
  [✔️] endertanks-1.12.0-1.6.8
  [✔️] EnderTweaker-1.12.2-1.2.3
  [✔️] engineers_doors-1.12.2-0.9.1
  [✔️] engineersdecor-1.12.2-1.1.4
  [✔️] Exchangers-1.12.2-2.10.1
  [✔️] ExtraCells-1.12.2-2.6.7
  [✔️] extrautils2-1.12-1.9.9
  [✔️] ExtremeReactors-1.12.2-0.4.5.68
  [✔️] FastLeafDecay-v14
  [✔️] foamfix-0.10.14-1.12.2
  [✔️] Forgelin-1.8.4
  [✔️] ForgeMultipart-1.12.2-2.6.2.83-universal
  [✔️] FTBLib-5.4.7.2
  [✔️] FTBUtilities-5.4.1.131
  [✔️] furniture-6.3.1-1.12.2
  [✔️] GalacticraftCore-1.12.2-4.0.2.280
  [✔️] Galacticraft-Planets-1.12.2-4.0.2.280
  [✔️] GunpowderLib-1.12.2-1.1
  [✔️] Hwyla-1.8.26-B41_1.12.2
  [✔️] ic2-tweaker-0.2.0
  [✔️] iChunUtil-1.12.2-7.2.2
  [✔️] ImmersiveCables-1.12.2-1.3.2
  [✔️] ImmersiveEngineering-0.12-98
  [✔️] immersiveintelligence-0.2.1
  [✔️] immersivepetroleum-1.12.2-1.1.10
  [✔️] immersivetweaker-0.1
  [✔️] industrialcraft-2-2.8.170-ex112
  [✔️] industrialforegoing-1.12.2-1.12.13-237
  [✔️] IntegrationForegoing-1.12.2-1.11
  [✔️] InventoryTweaks-1.63
  [✔️] IronBackpacks-1.12.2-3.0.8-12
  [✔️] ironchest-1.12.2-7.0.72.847
  [✔️] jei_1.12.2-4.16.1.301
  [✔️] jeiintegration_1.12.2-1.6.0
  [✔️] journeymap-1.12.2-5.7.1
  [✔️] JustEnoughEnergistics-1.12.2-1.0.8
  [✔️] JustEnoughPetroleum-0.1
  [✔️] JustEnoughResources-1.12.2-0.9.2.60
  [✔️] logisticspipes-0.10.3.114
  [✔️] malisiscore-1.12.2-6.5.1
  [✔️] malisisdoors-1.12.2-7.3.0
  [✔️] Mantle-1.12-1.3.3.55
  [✔️] mcjtylib-1.12-3.5.4
  [✔️] MCTImmersiveTechnology-1.12.2-1.9.100
  [✔️] Mekanism-1.12.2-9.8.3.390
  [✔️] MekanismGenerators-1.12.2-9.8.3.390
  [✔️] MekanismTools-1.12.2-9.8.3.390
  [✔️] mekores-2.0.13
  [✔️] MicdoodleCore-1.12.2-4.0.2.280
  [✔️] MineTweakerRecipeMaker-1.12.2-1.2.2.30
  [✔️] MJRLegendsLib-1.12.2-1.2.1
  [✔️] MmmMmmMmmMmm-1.12-1.14
  [✔️] moartinkers-0.6.0
  [✔️] MobGrindingUtils-0.3.13
  [✔️] modtweaker-4.0.20.5
  [✔️] ModularPowersuits-1.12.2-1.0.46
  [✔️] Morph-o-Tool-1.2-21
  [✔️] MouseTweaks-2.10-mc1.12.2
  [✔️] MrTJPCore-1.12.2-2.1.4.43-universal
  [✔️] MTLib-3.0.7
  [✔️] Netherending-Ores-1.12.2-1.4.2
  [✔️] NotEnoughIDs-1.5.4.4
  [✔️] Numina-1.12.2-1.0.38
  [✔️] OpenBlocks-1.12.2-1.8.1
  [✔️] OpenModsLib-1.12.2-0.12.2
  [✔️] OptiFine_1.12.2_HD_U_E3
  [✔️] p455w0rdslib-1.12.2-2.3.161
  [✔️] Patchouli-1.0-23.6
  [✔️] pneumaticcraft-repressurized-1.12.2-0.11.15-398
  [✔️] PortalGun-1.12.2-7.1.0
  [✔️] ProjectRed-1.12.2-4.9.4.120-Base
  [✔️] ProjectRed-1.12.2-4.9.4.120-compat
  [✔️] ProjectRed-1.12.2-4.9.4.120-integration
  [✔️] ProjectRed-1.12.2-4.9.4.120-lighting
  [✔️] ProjectRed-1.12.2-4.9.4.120-mechanical
  [✔️] ProjectRed-1.12.2-4.9.4.120-world
  [✔️] PTRLib-1.0.5
  [✔️] Quark-r1.6-179
  [✔️] railcraft-12.0.0
  [✔️] rangedpumps-0.5
  [✔️] RedstoneArsenal-1.12.2-2.6.6.1-universal
  [✔️] RedstoneFlux-1.12-2.1.1.1-universal
  [✔️] RedstoneRepository-1.12.2-2.0.0
  [✔️] RoguelikeDungeonsFnarEdition-1.12.2-2.4.1
  [✔️] rsgauges-1.12.2-1.2.5
  [✔️] rustic-1.1.7
  [✔️] shetiphiancore-1.12.0-3.5.9
  [✔️] SimplyJetpacks2-1.12.2-2.2.20.0
  [✔️] spark-forge
  [✔️] SteamWorld 1.12.2-0.4.0.2
  [✔️] StorageDrawers-1.12.2-5.4.2
  [✔️] tc6aspects4jei-0.0.2a
  [✔️] TConstruct-1.12.2-2.13.0.183
  [✔️] tesla-core-lib-1.12.2-1.0.18
  [✔️] Thaumcraft-1.12.2-6.1.BETA26
  [✔️] ThaumicAugmentation-1.12.2-2.1.5
  [✔️] thaumicenergistics-2.2.4
  [✔️] ThaumicJEI-1.12.2-1.6.0-27
  [✔️] thaumictinkerer-1.12.2-5.0-620a0c5
  [✔️] TheBetweenlands-3.8.1-universal
  [✔️] ThermalCultivation-1.12.2-0.3.6.1-universal
  [✔️] ThermalDynamics-1.12.2-2.5.6.1-universal
  [✔️] ThermalExpansion-1.12.2-5.5.7.1-universal
  [✔️] ThermalFoundation-1.12.2-2.6.7.1-universal
  [✔️] ThermalInnovation-1.12.2-0.3.6.1-universal
  [✔️] ThermalTinkering-1.12.2-2.0.1
  [✔️] TinkersComplement-1.12.2-0.4.3
  [✔️] tinkersjei-1.2
  [✔️] TMechworks-1.12.2-1.0.0
  [✔️] twilightforest-1.12.2-3.11.1021-universal
  [✔️] UniDict-1.12.2-3.0.10
  [✔️] WailaHarvestability-mc1.12-1.1.12
  [✔️] WanionLib-1.12.2-2.9
  [✔️] Wawla-1.12.2-2.6.275
  [✔️] WirelessCraftingTerminal-1.12.2-3.12.97
  [✔️] WR-CBE-1.12.2-2.3.2.33-universal
  [✔️] YABBA-1.1.2.54
  [✔️] zerocore-1.12.2-0.1.2.9

Duplicate of #148 , will be fixed in next push