GNU Smalltalk gst-browser crash

OS: Arch Linux
GST: GNU Smalltalk version 3.2.92-edb6bad6

Problem description: gst-browser crashes when loading previously saved images.

Steps to reproduce:
1. Create new image with `gst-browser -iI test.im`.
2. Create new class or namespace.
3. Exit gst-browser, saving the image.
4. Attempt to load image with `gst-browser -I test.im`.

Error output:
a Smalltalk Stream:3: Aborted
a Smalltalk Stream:3: Error occurred while not in byte code interpreter!!
/usr/lib/libgst.so.7(+0x75b68)[0x7f5df95d8b68]
/usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
/usr/lib/libc.so.6(gsignal+0x145)[0x7f5df93da755]
/usr/lib/libc.so.6(abort+0x125)[0x7f5df93c5851]
/usr/lib/libgst.so.7(+0x10042)[0x7f5df9573042]
/usr/lib/libsigsegv.so.2(+0xd4c)[0x7f5df919cd4c]
/usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
/usr/lib/libgtk-x11-2.0.so.0(gtk_notebook_set_tab_label+0x2f)[0x7f5df3a873ef]
/usr/lib/libffi.so.6(ffi_call_unix64+0x4c)[0x7f5df91976d0]
/usr/lib/libffi.so.6(ffi_call+0x230)[0x7f5df91970a0]
aborted (core dumped)

Full backtrace:
#0  0x00007f5df93da755 in raise () at /usr/lib/libc.so.6
#1  0x00007f5df93c5851 in abort () at /usr/lib/libc.so.6
#2  0x00007f5df9573042 in  () at /usr/lib/libgst.so.7
#3  0x00007f5df919cd4c in  () at /usr/lib/libsigsegv.so.2
#4  0x00007f5df93da7e0 in <signal handler called> () at /usr/lib/libc.so.6
#5  0x00007f5df3a873ef in gtk_notebook_set_tab_label () at /usr/lib/libgtk-x11-2.0.so.0
#6  0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
#7  0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
#8  0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
#9  0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
#10 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
#11 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
#12 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
#13 0x00007f5df526c938 in  () at /usr/lib/libgst-gobject.so.1
#14 0x00007f5df4959caa in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#15 0x00007f5df4947706 in  () at /usr/lib/libgobject-2.0.so.0
#16 0x00007f5df494b89a in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#17 0x00007f5df494c700 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#18 0x00007f5df3b4c2e7 in gtk_tree_selection_select_path () at /usr/lib/libgtk-x11-2.0.so.0
#19 0x00007f5df3b4c3e6 in gtk_tree_selection_select_iter () at /usr/lib/libgtk-x11-2.0.so.0
#20 0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
#21 0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
#22 0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
#23 0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
#24 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
#25 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
#26 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
#27 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
#28 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
#29 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
#30 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
#31 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
#32 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
#33 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
#34 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
#35 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
#36 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
#37 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
#38 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
#39 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
#40 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
#41 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
#42 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
#43 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
#44 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
#45 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
#46 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
#47 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
#48 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
#49 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
#50 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
#51 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
#52 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
#53 0x00007f5df957a1d2 in  () at /usr/lib/libgst.so.7
#54 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
#55 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
#56 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
#57 0x00007f5df95aa1b0 in  () at /usr/lib/libgst.so.7
#58 0x000055ab9a0f92dd in main ()