screen stop response while typing words

Scree stop response while typing words with fcitx with Chewing.
Screen behave normally while typing english.
When the screen stop response, system logs showed:
"NVRM: Xid (PCI:0000:01:00): 31, pid=30233, Ch 00000018, intr 10000000. MMU Fault: ENGINE HOST0 HUBCLIENT_HOST faulted @ 0x1_02290000. Fault is of type FAULT_PTE ACCESS_TYPE_READ"

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: fcitx 1:4.2.9.6-1
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Aug 6 18:03:13 2020
InstallationDate: Installed on 2018-04-29 (829 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
PackageArchitecture: all
SourcePackage: fcitx
UpgradeStatus: Upgraded to bionic on 2019-12-20 (229 days ago)