First of all this might be the wrong place to post so if appropriated please direct me. Second, I have a video of the issue. Issue description:
1. Selecting something on the menu bar as the sound settings crashes the whole ide.
2. System becomes unusable.

Expected behavior:
1. Pop up the relevant settings.


Relevant info about the machine:

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inxi -Fxzc0
System:
  Host: rohan Kernel: 5.6.15-1-MANJARO x86_64 bits: 64
  compiler: gcc v: 10.1.0 Desktop: KDE Plasma 5.18.5
  Distro: Manjaro Linux
Machine:
  Type: Desktop Mobo: Micro-Star
  model: Z390-A PRO (MS-7B98) v: 1.0 serial: <filter>
  UEFI: American Megatrends v: 1.80 date: 12/25/2019
CPU:
  Topology: 6-Core model: Intel Core i5-9600K bits: 64
  type: MCP arch: Kaby Lake rev: C L2 cache: 9216 KiB
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2
  ssse3 vmx
  bogomips: 44412
  Speed: 800 MHz min/max: 800/4700 MHz Core speeds (MHz):
  1: 800 2: 800 3: 800 4: 800 5: 800 6: 800
Graphics:
  Device-1: NVIDIA TU106 [GeForce RTX 2070]
  driver: nvidia v: 440.82 bus ID: 01:00.0
  Display: x11 server: X.Org 1.20.8 driver: nvidia
  resolution: 1920x1080~60Hz
  OpenGL: renderer: GeForce RTX 2070/PCIe/SSE2
  v: 4.6.0 NVIDIA 440.82 direct render: Yes
Audio:
  Device-1: Intel Cannon Lake PCH cAVS
  vendor: Micro-Star MSI driver: snd_hda_intel v: kernel
  bus ID: 00:1f.3
  Device-2: NVIDIA TU106 High Definition Audio
  driver: snd_hda_intel v: kernel bus ID: 01:00.1
  Device-3: Logitech type: USB
  driver: snd-usb-audio,uvcvideo bus ID: 1-1.4:6
  Sound Server: ALSA v: k5.6.15-1-MANJARO
Network:
  Device-1: Intel Ethernet I219-V vendor: Micro-Star MSI
  driver: e1000e v: 3.2.6-k port: efa0 bus ID: 00:1f.6
  IF: eno1 state: up speed: 100 Mbps duplex: full
  mac: <filter>
Drives:
  Local Storage: total: 912.89 GiB used: 18.33 GiB (2.0%)
  ID-1: /dev/sda vendor: Samsung model: SSD 840 EVO 500GB
  size: 465.76 GiB
  ID-2: /dev/sdb vendor: Kingston model: SA400S37480G
  size: 447.13 GiB
Partition:
  ID-1: / size: 150.74 GiB used: 18.30 GiB (12.1%)
  fs: ext4 dev: /dev/sdb1
Sensors:
  System Temperatures: cpu: 32.0 C mobo: N/A gpu: nvidia
  temp: 30 C
  Fan Speeds (RPM): N/A gpu: nvidia fan: 46%
Info:
  Processes: 237 Uptime: 5m Memory: 15.58 GiB
  used: 1.97 GiB (12.6%) Init: systemd Compilers:
  gcc: 10.1.0 Shell: bash v: 5.0.17 inxi: 3.0.37

I have some logs I could recover:

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jun 05 16:48:46 rohan audit[1984]: ANOM_ABEND auid=1000 uid=1000 gid=1000 ses=2 subj==unconfined pid=1984 comm="systemsettings5" exe="/usr/bin/systemsettings5" sig=11 res=1
jun 05 16:48:46 rohan kernel: systemsettings5[1984]: segfault at 0 ip 0000000000000000 sp 00007ffcff3d8828 error 14
jun 05 16:48:46 rohan kernel: Code: Bad RIP value.
jun 05 16:48:46 rohan kernel: audit: type=1701 audit(1591386526.254:91): auid=1000 uid=1000 gid=1000 ses=2 subj==unconfined pid=1984 comm="systemsettings5" exe="/usr/bin/systemsettings5" s>
jun 05 16:48:46 rohan systemd[1]: Created slice system-systemd\x2dcoredump.slice.
jun 05 16:48:46 rohan kernel: audit: type=1334 audit(1591386526.264:92): prog-id=15 op=LOAD
jun 05 16:48:46 rohan kernel: audit: type=1334 audit(1591386526.264:93): prog-id=16 op=LOAD
jun 05 16:48:46 rohan audit: AUDIT1334 prog-id=15 op=LOAD
jun 05 16:48:46 rohan audit: AUDIT1334 prog-id=16 op=LOAD
jun 05 16:48:46 rohan systemd[1]: Started Process Core Dump (PID 1997/UID 0).
jun 05 16:48:46 rohan audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@0-1997-0 comm="systemd" exe="/usr/lib/systemd/systemd" >
jun 05 16:48:46 rohan kernel: audit: type=1130 audit(1591386526.264:94): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@0-1997-0 comm="systemd" exe=>
jun 05 16:48:46 rohan kwin_x11[1200]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 40465, resource id: 92274694, major code: 15 (QueryTree), minor code: 0
jun 05 16:48:46 rohan kwin_x11[1200]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 40470, resource id: 92274694, major code: 18 (ChangeProperty), minor code: 0
jun 05 16:48:46 rohan kwin_x11[1200]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 40508, resource id: 31457494, major code: 18 (ChangeProperty), minor code: 0
jun 05 16:48:46 rohan systemd-coredump[1998]: Process 1984 (systemsettings5) of user 1000 dumped core.
                                             
                                              Stack trace of thread 1984:
                                              #0  0x0000000000000000 n/a (n/a + 0x0)

Can't reproduce this here on Kubuntu (same Plasma version<9, so might be specific to Manjaro, did you ask on their forums?