Minecraft Typing and Commands Issue

Whenever I log on Minecraft, everything goes smoothly until I type a phrase and hit enter. There, Minecraft immediately shuts down, or somewhat crashes instantaneously. This is insanely annoying, and I have tried searching up solutions to no avail. In addition to this, I have deleted Minecraft and re-installed, not a solution either. Considering I am the talkative type on Minecraft, and I can't use any commands, MC is plain useless.