PaulStretch segmentation fault

[dblanchemain]

Hello
With LibraZiK4 I get a segmentation fault with paulStretch when I click on the rightmost square (stop), which closes paulStretch.
This did not happen in previous versions of LibraziK.
What is the problem?

strace -o strace.txt paulstretch /home/dominique/kandiskyscore/Projets/Projet2/Audios/kurt.wav

execve("/usr/bin/paulstretch", ["paulstretch", "/home/dominique/kandiskyscore/Pr"..., "2"], 0x7fff2db98830 /* 55 vars */) = 0
brk(NULL)                               = 0x556ce8932000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (Aucun fichier ou dossier de ce type)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=194575, ...}) = 0
mmap(NULL, 194575, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f56663e5000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libfltk.so.1.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\375\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=706432, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f56663e3000
mmap(NULL, 727984, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f5666331000
mmap(0x7f566635d000, 393216, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2c000) = 0x7f566635d000
mmap(0x7f56663bd000, 102400, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8c000) = 0x7f56663bd000
mmap(0x7f56663d6000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa4000) = 0x7f56663d6000
mmap(0x7f56663de000, 19376, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f56663de000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libjack.so.0", O_RDONLY|O_CLOEXEC) = 3


........................................

select(4, [3], [], [], {tv_sec=0, tv_usec=98442}) = 1 (in [3], left {tv_sec=0, tv_usec=77123})
recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\5\1\3\rWl\315\0\246\2\0\0\2\0\0\5\0\0\0\0\256\0r\2\253\0\377\1\20\1\1\0", iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Ressource temporairement non disponible)
futex(0x556ce867b608, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x556ce867b620, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f5663bb99d0, FUTEX_WAIT, 38437, NULL) = ?
+++ killed by SIGSEGV +++