Game crashes when sign is edited via commands while still being in the editor

When merging the data of a sign via data merge whilst someone is editing the sign manually the game of the person who's still editing it crashes. The crash only occurs if the command will effect more than 1 Line.

For this to work you have to be in multiplayer.

1.13.2\: [^crash-2019-04-18_19.35.05-client.txt]

Description: charTyped event handler

java.lang.NullPointerException: charTyped event handler
	at clt.charTyped(SourceFile:65)
	at cfq.a(SourceFile:480)
	at cfq$$Lambda$1192/1027928413.run(Unknown Source)
	at ckd.a(SourceFile:430)
	at cfq.a(SourceFile:480)
	at cfq$$Lambda$841/1399693980.invoke(Unknown Source)
	at org.lwjgl.glfw.GLFWCharModsCallbackI.callback(GLFWCharModsCallbackI.java:39)
	at org.lwjgl.system.JNI.invokeV(Native Method)
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3108)
	at cgd.a(SourceFile:321)
	at cft.c(SourceFile:875)
	at cft.a(SourceFile:395)
	at net.minecraft.client.main.Main.main(SourceFile:144)


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

-- Head --
Thread: Client thread
Stacktrace:
	at clt.charTyped(SourceFile:65)
	at cfq.a(SourceFile:480)
	at cfq$$Lambda$1192/1027928413.run(Unknown Source)

-- Affected screen --
Details:
	Screen name: clt
Stacktrace:
	at ckd.a(SourceFile:430)
	at cfq.a(SourceFile:480)
	at cfq$$Lambda$841/1399693980.invoke(Unknown Source)
	at org.lwjgl.glfw.GLFWCharModsCallbackI.callback(GLFWCharModsCallbackI.java:39)
	at org.lwjgl.system.JNI.invokeV(Native Method)
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3108)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [ctj['iKirbs'/47148, l='MpServer', x=-3946.22, y=71.00, z=1164.50]]
	Chunk stats: MultiplayerChunkCache: 169, 169
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: {}
	Level spawn location: World: (-1006,71,962), Chunk: (at 2,4,2 in -63,60; contains blocks -1008,0,960 to -993,255,975), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
	Level time: 20063035 game time, 3169290 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 47 total; [ctj['iKirbs'/47148, l='MpServer', x=-3946.22, y=71.00, z=1164.50], akq['Horse'/47234, l='MpServer', x=-3884.85, y=66.00, z=1095.01], apl['Minecart with Chest'/47237, l='MpServer', x=-3883.50, y=21.06, z=1238.50], amt['Creeper'/47240, l='MpServer', x=-3870.50, y=30.00, z=1091.50], akq['Horse'/47242, l='MpServer', x=-3866.62, y=75.00, z=1104.86], ann['Skeleton'/47243, l='MpServer', x=-3870.50, y=56.00, z=1127.50], ajr['Chicken'/47155, l='MpServer', x=-4020.88, y=75.00, z=1086.51], ajr['Chicken'/47156, l='MpServer', x=-4016.34, y=75.00, z=1091.20], ann['Skeleton'/47157, l='MpServer', x=-4022.25, y=73.00, z=1119.76], akf['Sheep'/47158, l='MpServer', x=-4016.11, y=73.00, z=1133.45], aks['Llama'/47159, l='MpServer', x=-4019.59, y=101.00, z=1240.50], ann['Skeleton'/47164, l='MpServer', x=-4006.34, y=73.00, z=1087.79], akf['Sheep'/47167, l='MpServer', x=-4009.65, y=74.00, z=1090.19], akf['Sheep'/47169, l='MpServer', x=-4014.48, y=74.00, z=1159.26], ajr['Chicken'/47170, l='MpServer', x=-4002.50, y=71.00, z=1218.78], apl['Minecart with Chest'/47172, l='MpServer', x=-4005.50, y=22.06, z=1242.50], akf['Sheep'/47173, l='MpServer', x=-4013.50, y=86.00, z=1232.27], ajl['Bat'/47175, l='MpServer', x=-3988.59, y=34.93, z=1086.06], akf['Sheep'/47179, l='MpServer', x=-3994.19, y=66.00, z=1178.69], akf['Sheep'/47180, l='MpServer', x=-3981.81, y=73.00, z=1226.50], ajl['Bat'/47181, l='MpServer', x=-3996.29, y=42.18, z=1233.08], amm['Egg'/47695, l='MpServer', x=-3908.50, y=66.00, z=1123.98], akf['Sheep'/47187, l='MpServer', x=-3980.58, y=65.00, z=1159.73], ajr['Chicken'/47188, l='MpServer', x=-3975.89, y=74.00, z=1218.39], akf['Sheep'/47190, l='MpServer', x=-3982.50, y=68.00, z=1220.27], ajr['Chicken'/47191, l='MpServer', x=-3980.88, y=75.00, z=1243.54], ajr['Chicken'/47198, l='MpServer', x=-3954.11, y=74.00, z=1221.63], akq['Horse'/47200, l='MpServer', x=-3941.08, y=66.00, z=1137.13], ajr['Chicken'/47201, l='MpServer', x=-3981.40, y=65.00, z=1164.84], apl['Minecart with Chest'/47202, l='MpServer', x=-3943.50, y=22.06, z=1215.50], apl['Minecart with Chest'/47203, l='MpServer', x=-3938.50, y=22.06, z=1224.50], amm['Egg'/47971, l='MpServer', x=-3953.79, y=74.00, z=1221.57], amm['Egg'/47972, l='MpServer', x=-4002.82, y=71.00, z=1218.56], amm['Arrow'/47973, l='MpServer', x=-3996.16, y=68.00, z=1114.68], amm['Bone'/47974, l='MpServer', x=-3996.58, y=68.00, z=1113.73], amm['Egg'/47975, l='MpServer', x=-3904.55, y=75.00, z=1174.86], apl['Minecart with Chest'/47209, l='MpServer', x=-3930.50, y=20.06, z=1159.50], apl['Minecart with Chest'/47215, l='MpServer', x=-3914.50, y=18.06, z=1157.50], akq['Horse'/47216, l='MpServer', x=-3909.11, y=76.00, z=1154.11], akq['Horse'/47217, l='MpServer', x=-3915.99, y=75.00, z=1152.09], ajr['Chicken'/47218, l='MpServer', x=-3904.08, y=75.00, z=1174.46], amm['Egg'/47987, l='MpServer', x=-3976.43, y=74.00, z=1218.83], akq['Horse'/47220, l='MpServer', x=-3916.12, y=75.00, z=1188.64], apo['Minecart with Hopper'/47221, l='MpServer', x=-3909.50, y=70.06, z=1205.82], akq['Horse'/47223, l='MpServer', x=-3897.86, y=67.00, z=1099.96], ajr['Chicken'/47224, l='MpServer', x=-3909.22, y=66.00, z=1123.50], apk['Minecart'/47225, l='MpServer', x=-3898.29, y=66.82, z=1244.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at crg.a(SourceFile:418)
	at cft.b(SourceFile:1815)
	at cft.a(SourceFile:403)
	at net.minecraft.client.main.Main.main(SourceFile:144)

-- System Details --
Details:
	Minecraft Version: 1.13.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 719970464 bytes (686 MB) / 1744830464 bytes (1664 MB) up to 2147483648 bytes (2048 MB)
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Launched Version: 1.13.2
	LWJGL: 3.1.6 build 14
	OpenGL: GeForce GTX 1080/PCIe/SSE2 GL version 4.6.0 NVIDIA 425.31, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: vanilla, file/jolicraft-1534218229.zip, file/Connected Glass by Gheppio.zip (incompatible)
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 8x Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz