[pix_multitexture] crash when freed

Program received signal SIGSEGV, Segmentation fault.
0x00000000004710c0 in inlet_free ()
(gdb) thread apply all bt

Thread 3 (Thread 0x7fffe1a5c700 (LWP 3732)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ffff3dddb89 in freeze (this=0xc41470, this=0xc41470)
    at ThreadSemaphore.cpp:52
#2  gem::thread::Semaphore::freeze (this=<optimized out>)
    at ThreadSemaphore.cpp:74
#3  0x00007ffff3dded50 in gem::thread::WorkerThread::PIMPL::process (
    you=0xca3120) at WorkerThread.cpp:117
#4  0x00007ffff739f182 in start_thread (arg=0x7fffe1a5c700)
    at pthread_create.c:312
#5  0x00007ffff6ec838d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7ffff7fbb740 (LWP 3720)):
#0  0x00000000004710c0 in inlet_free ()
#1  0x00007ffff3f749b1 in pix_multitexture::~pix_multitexture (this=0x7cdd70,
    __in_chrg=<optimized out>) at pix_multitexture.cpp:72
#2  0x00007ffff3f74a09 in pix_multitexture::~pix_multitexture (this=0x7cdd70,
    __in_chrg=<optimized out>) at pix_multitexture.cpp:76
#3  0x000000000046e1e9 in pd_free ()
#4  0x00000000004179fd in glist_delete ()
#5  0x000000000044ee0e in canvas_doclear ()
#6  0x000000000045218d in canvas_cut ()
#7  0x00000000004701ad in pd_typedmess ()
#8  0x000000000046ff6c in pd_typedmess ()
#9  0x00000000004799fc in binbuf_eval ()
#10 0x00000000004843ac in socketreceiver_read ()
#11 0x000000000048372d in sys_domicrosleep.constprop ()
#12 0x0000000000480070 in m_mainloop ()
#13 0x00007ffff6deeec5 in __libc_start_main (main=0x411eb0 <main>, argc=5,
    argv=0x7fffffffdee8, init=<optimized out>, fini=<optimized out>,
    rtld_fini=<optimized out>, stack_end=0x7fffffffded8) at libc-start.c:287
#14 0x0000000000411ede in _start ()