Typing text in command block crashes the game

I was able to wrtie some text before the crash.
Command blocks was not enabled on the server.
maybe i pressed some dumb key.

log:

[14:32:26] [Render thread/INFO]: [CHAT] Command blocks are not enabled on this server
[14:32:32] [Render thread/FATAL]: Reported exception thrown!
u: charTyped event handler
	at doq.a(SourceFile:440) ~[1.16.2.jar:?]
	at dju.a(SourceFile:419) ~[1.16.2.jar:?]
	at dju.c(SourceFile:434) ~[1.16.2.jar:?]
	at any.execute(SourceFile:94) ~[1.16.2.jar:?]
	at dju.b(SourceFile:434) ~[1.16.2.jar:?]
	at org.lwjgl.glfw.GLFWCharModsCallbackI.callback(GLFWCharModsCallbackI.java:39) ~[lwjgl-glfw-3.2.2.jar:build 10]
	at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10]
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) ~[lwjgl-glfw-3.2.2.jar:build 10]
	at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) ~[1.16.2.jar:?]
	at djw.e(SourceFile:1046) ~[1.16.2.jar:?]
	at djw.e(SourceFile:656) [1.16.2.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:215) [1.16.2.jar:?]
Caused by: java.lang.NullPointerException
	at dd.b(SourceFile:190) ~[1.16.2.jar:?]
	at du.listSuggestions(SourceFile:61) ~[1.16.2.jar:?]
	at com.mojang.brigadier.tree.ArgumentCommandNode.listSuggestions(ArgumentCommandNode.java:69) ~[brigadier-1.0.17.jar:?]
	at com.mojang.brigadier.CommandDispatcher.getCompletionSuggestions(CommandDispatcher.java:596) ~[brigadier-1.0.17.jar:?]
	at dlj.a(SourceFile:182) ~[1.16.2.jar:?]
	at dpl.b(SourceFile:125) ~[1.16.2.jar:?]
	at dln.d(SourceFile:148) ~[1.16.2.jar:?]
	at dln.b(SourceFile:143) ~[1.16.2.jar:?]
	at dln.a(SourceFile:355) ~[1.16.2.jar:?]
	at dme.a(SourceFile:74) ~[1.16.2.jar:?]
	at dju.a(SourceFile:419) ~[1.16.2.jar:?]
	at doq.a(SourceFile:435) ~[1.16.2.jar:?]
	... 11 more