libproxy makes crash epiphany on 2nd proxy pac resolution

Reproducible with ubuntu 11.04 natty and libproxy0 0.3.1-2ubuntu5

1. Set a proxy pac in gnome-proxy configuration
2. Open epiphany
3. Go to any URL
4. Click on any link or got to another URL

Epiphany crashes with SIGSEV

After installing the -dbg packages and running with gdb, this is the stack trace I have:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff9870c700 (LWP 24816)]
0x00007ffff1cbce56 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffff1cbce56 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007fffdbf67318 in ?? () from /usr/lib/libproxy/0.3.1/modules/pacrunner_webkit.so
#2 0x00007fffdeb1c059 in px_proxy_factory_get_proxies () from /usr/lib/libproxy.so.0
#3 0x00007fffded2146c in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libgiolibproxy.so
#4 0x00007fffded21583 in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libgiolibproxy.so
#5 0x00007ffff28cbb2c in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#6 0x00007ffff28bd576 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#7 0x00007ffff1f8ab16 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8 0x00007ffff1f883e4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007ffff6023d8c in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007ffff1c7004d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()
(gdb)