SIGSEGV on QBluetoothDeviceInfo::operator=(QBluetoothDeviceInfo const&)

I encountered a SIGSEGV on 

0x7650367c in QBluetoothDeviceInfo::operator=(QBluetoothDeviceInfo const&) () from /usr/lib/arm-linux-gnueabihf/libQt5Bluetooth.so.5

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full backtrace

{{}} {{qt.bluetooth.bluez: BluetoothManagement: Ignored event: 13
qt.bluetooth.bluez: BluetoothManagement: Ignored event: 13
qt.bluetooth.bluez: Updating RSSI for "34:81:F4:30:0D:FD" QVariant(short, -51)
qt.bluetooth.bluez: Discovery on: "7A:B3:2D:CF:77:8E" Mode: QBluetoothServiceDiscoveryAgent::DiscoveryMode(FullDiscovery)
[Detaching after fork from child process 7025]
qt.bluetooth.bluez: BluetoothManagement: Ignored event: 13
SDP for 7A:B3:2D:CF:77:8E B8:27:EB:9C:37:E2
qt.bluetooth.bluez: BluetoothManagement: Ignored event: d
Cannot establish sdp session
qt.bluetooth.bluez: BluetoothManagement: Ignored event: d
qt.bluetooth.bluez: SDP scan failure QProcess::ExitStatus(NormalExit) 3
qt.bluetooth.bluez: Discovery on: "34:81:F4:30:0D:FD" Mode: QBluetoothServiceDiscoveryAgent::DiscoveryMode(FullDiscovery)
[Detaching after fork from child process 7047]
SDP for 34:81:F4:30:0D:FD B8:27:EB:9C:37:E2
qt.bluetooth.bluez: BluetoothManagement: Ignored event: b
Using PUBLIC_BROWSE_GROUP for SDP search
qt.bluetooth.bluez: Discovered services "34:81:F4:30:0D:FD" "" "{00000000-0000-0000-0000-000000000000}" >>> ("{00001200-0000-1000-8000-00805f9b34fb}")
"Thu Oct 15 10:32:06 2020Found new service: ({00000000-0000-0000-0000-000000000000})\n"
qt.bluetooth.bluez: Discovered services "34:81:F4:30:0D:FD" "SerialPort" "{00000000-0000-0000-0000-000000000000}" >>> ("{00001101-0000-1000-8000-00805f9b34fb}")
"Thu Oct 15 10:32:06 2020Found new service: SerialPort({00000000-0000-0000-0000-000000000000})\n"
"Thu Oct 15 10:32:06 2020Serial port service found\n"
qt.bluetooth.bluez: void QBluetoothServiceDiscoveryAgentPrivate::stop() Stop called
"Thu Oct 15 10:32:06 2020Create socket\n"
"Thu Oct 15 10:32:06 2020ConnectToService done\n"

Thread 1 "qdomyos-zwift" received signal SIGSEGV, Segmentation fault.
0x7650367c in QBluetoothDeviceInfo::operator=(QBluetoothDeviceInfo const&) () from /usr/lib/arm-linux-gnueabihf/libQt5Bluetooth.so.5
(gdb)
(gdb)
(gdb)
(gdb)
(gdb) thread apply all bt

Thread 2 (Thread 0x732853c0 (LWP 6602)):
#0 _GI__poll (timeout=-1, nfds=2, fds=0x7290ca48) at ../sysdeps/unix/sysv/linux/poll.c:29
#1 _GI__poll (fds=0x7290ca48, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:26
#2 0x7557aeb4 in ?? () from /usr/lib/arm-linux-gnueabihf/libglib-2.0.so.0
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 1 (Thread 0x76ff2290 (LWP 6599)):
#0 0x7650367c in QBluetoothDeviceInfo::operator=(QBluetoothDeviceInfo const&) () from /usr/lib/arm-linux-gnueabihf/libQt5Bluetooth.so.5
#1 0x765513b4 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Bluetooth.so.5
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)}}

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You can find the full source code here: {{}}

https://github.com/cagnulein/qdomyos-zwift/blob/toorx/src/toorxtreadmill.cpp