That bug has been opened https://launchpad.net/ubuntu/+source/compiz/+bug/82205

"Binary package hint: compiz

Almost all time when I log in using my user account, Compiz crash -> a crash report window tell me about that - NOTE that I log-in into a Gnome Session NOT XGL.
...
ExecutablePath: /usr/bin/gtk-window-decorator
Package: compiz-gnome 1:0.3.6-1ubuntu2
ProcCmdline: gtk-window-decorator --replace
..."

Debug backtrace for the crash:

#0  cairo_set_source_rgba (cr=0x0, red=0.92941176470588238, green=0.9137254901960784, blue=0.8901960784313725, alpha=1)
    at /build/buildd/libcairo-1.3.14/src/cairo.c:632
        pattern = <value optimized out>
#1  0x0804ead0 in gdk_cairo_set_source_color_alpha (cr=0x0, color=<value optimized out>, alpha=1)
    at ../../../gtk/window-decorator/gtk-window-decorator.c:514
No locals.
#2  0x08053cec in meta_draw_window_decoration (d=0xbfeb2814) at ../../../gtk/window-decorator/gtk-window-decorator.c:1693
        xdisplay = (Display *) 0x806d418
        pixmap = (GdkPixmap *) 0x0
        src = <value optimized out>
        button_states = {META_BUTTON_STATE_NORMAL <repeats 16 times>}
        button_layout = {left_buttons = {META_BUTTON_FUNCTION_MENU, META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, 
    META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, 
    META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST}, right_buttons = {
    META_BUTTON_FUNCTION_MINIMIZE, META_BUTTON_FUNCTION_MAXIMIZE, META_BUTTON_FUNCTION_CLOSE, META_BUTTON_FUNCTION_LAST, 
    META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST, 
    META_BUTTON_FUNCTION_LAST, META_BUTTON_FUNCTION_LAST}}
        fgeom = {left_width = 5, right_width = 5, top_height = 24, bottom_height = 5, width = 27, height = 35, 
  title_rect = {x = 6, y = 1, width = 15, height = 21}, left_titlebar_edge = 4, right_titlebar_edge = 4, 
  top_titlebar_edge = 1, bottom_titlebar_edge = 2, close_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, max_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, min_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, menu_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, shade_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, above_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, stick_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, unshade_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, unabove_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, unstick_rect = {visible = {x = 0, y = 0, width = 0, height = 0}, 
    clickable = {x = 0, y = 0, width = 0, height = 0}}, left_left_background = {x = 0, y = 0, width = 0, height = 0}, 
  left_middle_backgrounds = {{x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, 
      width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, 
      y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}}, 
  left_right_background = {x = 0, y = 0, width = 0, height = 0}, right_left_background = {x = 0, y = 0, width = 0, 
    height = 0}, right_middle_backgrounds = {{x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, 
      height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, 
      width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, y = 0, width = 0, height = 0}, {x = 0, 
      y = 0, width = 0, height = 0}}, right_right_background = {x = 0, y = 0, width = 0, height = 0}, 
  top_left_corner_rounded_radius = 5, top_right_corner_rounded_radius = 5, bottom_left_corner_rounded_radius = 5, 
  bottom_right_corner_rounded_radius = 5}
        flags = 2162
        theme = (MetaTheme *) 0x80c8108
        style = (GtkStyle *) 0x80bc000
        cr = (cairo_t *) 0x0
        size = <value optimized out>
        i = <value optimized out>
---Type <return> to continue, or q <return> to quit---
        clip = {x = 7, y = 7, width = 27, height = 35}
        rect = {x = 0, y = 0, width = 27, height = 0}
        drawable = <value optimized out>
        region = <value optimized out>
        alpha = 1
        shade_alpha = 1
        frame_style = (MetaFrameStyle *) 0x80e4170
        bg_color = {pixel = 15591907, red = 60909, green = 59881, blue = 58339}
        bg_alpha = 1
#3  0x0805107b in draw_border_shape (xdisplay=0x806d418, pixmap=20971625, picture=20971627, width=43, height=51, 
    c=0x8058740, closure=0x0) at ../../../gtk/window-decorator/gtk-window-decorator.c:4961
        screen = <value optimized out>
        colormap = <value optimized out>
        d = {event_windows = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}, button_windows = {0, 0, 0, 0}, button_states = {0, 0, 0, 
    0}, pixmap = 0x81102c0, buffer_pixmap = 0x0, gc = 0x0, border_layout = {width = 43, height = 51, left = {x1 = 0, 
      y1 = 31, x2 = 12, y2 = 37, pad = 0}, right = {x1 = 29, y1 = 31, x2 = 43, y2 = 37, pad = 0}, top = {x1 = 0, y1 = 0, 
      x2 = 43, y2 = 31, pad = 0}, bottom = {x1 = 0, y1 = 37, x2 = 43, y2 = 51, pad = 0}, rotation = 0}, 
  context = 0x8058740, shadow = 0x0, picture = 20971627, button_width = 0, width = 43, height = 51, decorated = 0, 
  active = 1, layout = 0x0, name = 0x0, icon = 0x0, icon_pixmap = 0x0, icon_pixbuf = 0x0, state = 0, actions = 0, 
  prop_xid = 0, force_quit_dialog = 0x0, draw = 0x8053a70 <meta_draw_window_decoration>}
        save_decoration_alpha = 0.5
        white = {red = 65535, green = 65535, blue = 65535, alpha = 65535}
#4  0xb7fb65d4 in decor_shadow_create () from /usr/lib/libdecoration.so.0
No symbol table info available.
#5  0x08050e01 in update_shadow () at ../../../gtk/window-decorator/gtk-window-decorator.c:5015
        opt = {shadow_radius = 8, shadow_opacity = 0.5, shadow_color = {0, 0, 0}, shadow_offset_x = 1, 
  shadow_offset_y = 1}
        xdisplay = (Display *) 0x806d418
        display = <value optimized out>
        screen = (GdkScreen *) 0x807a0d0
#6  0x080569c9 in main (argc=Cannot access memory at address 0x0
) at ../../../gtk/window-decorator/gtk-window-decorator.c:5979
        gdkdisplay = <value optimized out>
        xdisplay = (Display *) 0x806d418
        gdkscreen = (GdkScreen *) 0x807a0d0
        screen = (WnckScreen *) 0x80a3660
        i = 3
        j = <value optimized out>
        status = <value optimized out>
        replace = 0
        meta_theme = 0x0
#7  0xb75eeebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#8  0x0804cd81 in _start ()
No symbol table info available.