java.lang.IllegalArgumentException while placing signs

Put the summary of the bug you're having here

What I expected to happen was...:
The game to run without crashing

What actually happened was...:
The game crashed to the desktop

Steps to Reproduce:
1. Dig an L-shaped hole, with a ladders in one section and blank signs in the centre section.
2. Continue digging and placing signs
3. Game will crash after a few minutes

Crash report:

1.14.4\: [^crash-2019-07-27_13.11.19-client.txt]

Description: Rendering screen

java.lang.IllegalArgumentException: Cannot get property bwo{name=facing, clazz=class fb, values=[north, south, west, east]} as it does not exist in Block{minecraft:air}
	at bvs.c(SourceFile:95)
	at dek.render(SourceFile:118)
	at dnc.a(SourceFile:686)
	at cyc.e(SourceFile:954)
	at cyc.b(SourceFile:410)
	at net.minecraft.client.main.Main.main(SourceFile:155)


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

-- Head --
Thread: Client thread
Stacktrace:
	at bvs.c(SourceFile:95)
	at dek.render(SourceFile:118)

-- Screen render details --
Details:
	Screen name: dek
	Mouse location: Scaled: (306, 193). Absolute: (613.000000, 386.000000)
	Screen size: Scaled: (614, 386). Absolute: (1227, 772). Scale factor of 2.000000

-- Affected level --
Details:
	All players: 1 total; [dmp['nqbw'/91426, l='MpServer', x=-982.20, y=49.00, z=-649.70]]
	Chunk stats: Client Chunk Cache: 729, 483
	Level dimension: minecraft:overworld
	Level name: MpServer
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: {}
	Level spawn location: World: (-176,68,-206), Chunk: (at 0,4,2 in -11,-13; contains blocks -176,0,-208 to -161,255,-193), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 214075343 game time, 208039082 day time
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at dkf.a(SourceFile:421)
	at cyc.b(SourceFile:1923)
	at cyc.b(SourceFile:425)
	at net.minecraft.client.main.Main.main(SourceFile:155)