the program icon on the panel disappears

[brokera]

===================================================================
 Info
===================================================================
           PID: 3872 (xneur)
           UID: 1000 (andypc)
           GID: 1000 (andypc)
        Signal: 11 (SEGV)
     Timestamp: Fri 2021-04-30 10:03:53 EEST (5min ago)
  Command Line: xneur
    Executable: /usr/bin/xneur
 Control Group: /user.slice/user-1000.slice/session-c2.scope
          Unit: session-c2.scope
         Slice: user-1000.slice
       Session: c2
     Owner UID: 1000 (andypc)
       Boot ID: 70edb880927a45939bb3c787aef9522a
    Machine ID: 775ccb91c8f84539a863dbbb02766c59
      Hostname: andypc
       Storage: /var/lib/systemd/coredump/core.xneur.1000.70edb880927a45939bb3c787aef9522a.3872.1619766233000000.lz4
       Message: Process 3872 (xneur) of user 1000 dumped core.

                Stack trace of thread 3872:
                #0 0x00007f464bca1db4 __GI___libc_realloc (libc.so.6)
                #1 0x00007f464c7680e2 n/a (libxneur.so.20)
                #2 0x00007f464c76c0cc n/a (libxneur.so.20)
                #3 0x00007f464c76f5d9 n/a (libxneur.so.20)
                #4 0x0000555ecbf226ce n/a (xneur)
                #5 0x00007f464bc2abf7 __libc_start_main (libc.so.6)
                #6 0x0000555ecbf227ea n/a (xneur)

                Stack trace of thread 3880:
                #0 0x00007f464bd1dcb9 __GI___poll (libc.so.6)
                #1 0x00007f464a2eb6e9 n/a (libglib-2.0.so.0)
                #2 0x00007f464a2eb7fc g_main_context_iteration (libglib-2.0.so.0)
                #3 0x00007f464a2eb841 n/a (libglib-2.0.so.0)
                #4 0x00007f464a3132a5 n/a (libglib-2.0.so.0)
                #5 0x00007f464c3396db start_thread (libpthread.so.0)
                #6 0x00007f464bd2a71f __clone (libc.so.6)

                Stack trace of thread 3881:
                #0 0x00007f464bd1dcb9 __GI___poll (libc.so.6)
                #1 0x00007f464a2eb6e9 n/a (libglib-2.0.so.0)
                #2 0x00007f464a2eba82 g_main_loop_run (libglib-2.0.so.0)
                #3 0x00007f4648fc42d6 n/a (libgio-2.0.so.0)
                #4 0x00007f464a3132a5 n/a (libglib-2.0.so.0)
                #5 0x00007f464c3396db start_thread (libpthread.so.0)
                #6 0x00007f464bd2a71f __clone (libc.so.6)
===================================================================
 GDB Log
===================================================================
[New LWP 3872]
[New LWP 3880]
[New LWP 3881]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `xneur'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __GI___libc_realloc (oldmem=0x70, bytes=1) at malloc.c:3165
3165 malloc.c: No such file or directory.
[Current thread is 1 (Thread 0x7f464cb6f240 (LWP 3872))]

===================================================================
 GDB Backtrace
===================================================================
[New LWP 3872]
[New LWP 3880]
[New LWP 3881]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `xneur'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __GI___libc_realloc (oldmem=0x70, bytes=1) at malloc.c:3165
3165 malloc.c: No such file or directory.
[Current thread is 1 (Thread 0x7f464cb6f240 (LWP 3872))]
#0 0x00007f464bca1db4 in __GI___libc_realloc (oldmem=0x70, bytes=1) at malloc.c:3165
#1 0x00007f464c7680e2 in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#2 0x00007f464c76c0cc in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#3 0x00007f464c76f5d9 in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#4 0x0000555ecbf226ce in ()
#5 0x00007f464bc2abf7 in __libc_start_main (main=0x555ecbf22380, argc=1, argv=0x7fff42c60a98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff42c60a88) at ../csu/libc-start.c:310
#6 0x0000555ecbf227ea in ()

===================================================================
 GDB Backtrace (all threads)
===================================================================
[New LWP 3872]
[New LWP 3880]
[New LWP 3881]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `xneur'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __GI___libc_realloc (oldmem=0x70, bytes=1) at malloc.c:3165
3165 malloc.c: No such file or directory.
[Current thread is 1 (Thread 0x7f464cb6f240 (LWP 3872))]

Thread 3 (Thread 0x7f4644f7e700 (LWP 3881)):
#0 0x00007f464bd1dcb9 in __GI___poll (fds=0x7f464001e0e0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1 0x00007f464a2eb6e9 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f464a2eba82 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f4648fc42d6 in () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4 0x00007f464a3132a5 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007f464c3396db in start_thread (arg=0x7f4644f7e700) at pthread_create.c:463
        pd = 0x7f4644f7e700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139939781535488, -4241799386768892868, 139939781533312, 0, 93865695826720, 139939798317104, 4300533029172649020, 4300517122455346236}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6 0x00007f464bd2a71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f464577f700 (LWP 3880)):
#0 0x00007f464bd1dcb9 in __GI___poll (fds=0x7f4640009a60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1 0x00007f464a2eb6e9 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f464a2eb7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f464a2eb841 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007f464a3132a5 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007f464c3396db in start_thread (arg=0x7f464577f700) at pthread_create.c:463
        pd = 0x7f464577f700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139939789928192, -4241799386768892868, 139939789926016, 0, 93865695826560, 139939798317152, 4300536328244403260, 4300517122455346236}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6 0x00007f464bd2a71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f464cb6f240 (LWP 3872)):
#0 0x00007f464bca1db4 in __GI___libc_realloc (oldmem=0x70, bytes=1) at malloc.c:3165
        ar_ptr = <optimized out>
        nb = <optimized out>
        newp = <optimized out>
        hook = <optimized out>
        oldp = <optimized out>
        oldsize = <optimized out>
#1 0x00007f464c7680e2 in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#2 0x00007f464c76c0cc in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#3 0x00007f464c76f5d9 in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#4 0x0000555ecbf226ce in ()
#5 0x00007f464bc2abf7 in __libc_start_main (main=0x555ecbf22380, argc=1, argv=0x7fff42c60a98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff42c60a88) at ../csu/libc-start.c:310
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 8043303633326677052, 93865636931520, 140734313663120, 0, 0, 4241436896291167292, 4300531287895415868}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7f464c98d8d3 <_dl_init+259>, 0x7f464c75bdb0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 1285085395}}}
        not_first_call = <optimized out>
#6 0x0000555ecbf227ea in ()
#0 0x00007f464bca1db4 in __GI___libc_realloc (oldmem=0x70, bytes=1) at malloc.c:3165
#1 0x00007f464c7680e2 in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#2 0x00007f464c76c0cc in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#3 0x00007f464c76f5d9 in () at /usr/lib/x86_64-linux-gnu/libxneur.so.20
#4 0x0000555ecbf226ce in ()
#5 0x00007f464bc2abf7 in __libc_start_main (main=0x555ecbf22380, argc=1, argv=0x7fff42c60a98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff42c60a88) at ../csu/libc-start.c:310
#6 0x0000555ecbf227ea in ()