Quicklauncher crashed with segfault when clicked when the Applications Menu is opened in XFCE version 4.08

Steps to reproduce:
- add some commands to the quicklauncher
- click the Applications Menu button. The applications menu will open
- move cursor to the menu
- then click a button in the quicklauncher.

The quicklauncher crashes with a segfault error. Attaching gdb to the plugin process shows the following:

Program received signal SIGSEGV, Segmentation fault.
0x00007fd6aab7aff6 in launcher_clicked () from /usr/lib/xfce4/panel-plugins/libquicklauncher.so
(gdb) bt
#0  0x00007fd6aab7aff6 in launcher_clicked () from /usr/lib/xfce4/panel-plugins/libquicklauncher.so
#1  0x00007fd6b1486099 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#2  0x00007fd6b07146e0 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3  0x00007fd6b0725750 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#4  0x00007fd6b072d2db in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#5  0x00007fd6b072d852 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007fd6b159d93e in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#7  0x00007fd6b1484434 in gtk_propagate_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#8  0x00007fd6b148478b in gtk_main_do_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#9  0x00007fd6b10f17ac in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#10 0x00007fd6b003f355 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007fd6b003f688 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007fd6b003fa82 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fd6b1483797 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#14 0x00007fd6b1dc0a51 in main ()