pavucontrol X Window System error "The error was 'BadIDChoice (invalid resource ID chosen for this connection)'"

[janvda]

After the upgrade to balena host os version 2.43.0+rev1: the service pulseaudio-client-tcp reported the following error for test_id = 3 (= pavucontrol)

05.10.19 17:01:28 (+0200)  pulseaudio-client-tcp  launching pavucontrol ...
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp  
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp  (pavucontrol:24): Gdk-ERROR **: 15:01:55.067: The program 'pavucontrol' received an X Window System error.
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp  This probably reflects a bug in the program.
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp  The error was 'BadIDChoice (invalid resource ID chosen for this connection)'.
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp    (Details: serial 24992 error_code 14 request_code 53 (core protocol) minor_code 0)
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp    (Note to programmers: normally, X errors are reported asynchronously;
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp     that is, you will receive the error a while after causing it.
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp     To debug your program, run it with the GDK_SYNCHRONIZE environment
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp     variable to change this behavior. You can then get a meaningful
05.10.19 17:01:55 (+0200)  pulseaudio-client-tcp     backtrace from your debugger if you break on the gdk_x_error() function.)
05.10.19 17:01:58 (+0200)  pulseaudio-client-tcp  ./start.sh: line 43:    24 Trace/breakpoint trap   (core dumped) DISPLAY=$remote_display pavucontrol
05.10.19 17:01:58 (+0200)  pulseaudio-client-tcp  sleeping forever ...

[janvda]

This error I didn't have in the past. It is not clear what caused it. Is it the upgrade to balena host os version 2.43.0 ?