Too fast clicking at stop, cause segfault

Describe the bug Too fast clicking at stop button(probably I clicked twice before app even started), cause instant app crash with message

QProcess: Destroyed while process ("/usr/bin/perf") is still running.
/tmp/.mount_hotspoxwQbgH/AppRun.wrapped: line 6: 338848 Segmentation fault      (core dumped) LD_LIBRARY_PATH="$d/usr/lib":$LD_LIBRARY_PATH "$bin/hotspot" "$@"

Screenshots

https://github.com/KDAB/hotspot/assets/41945903/c0cfa782-a3a6-42ed-a374-c2872d0e04ed

Version Info (please complete the following information):

Linux Kernel version: 6.5.0
perf version: 6.5.3
hotspot version (appimage? selfcompiled?): hotspot-v1.4.1-254-g3c5c1bb-x86_64.AppImage
if self-compiled hotspot, what version of elfutils:

KDAB / hotspot

Too fast clicking at stop, cause segfault #576