Error in journal log when lock screen
When lock screen, there is error in journal log.
Mar 07 14:24:44 localhost gnome-shell[2941]: Object St.BoxLayout (0x5597cbf57500), has been already deallocated - impossible to access to it. This might be caused by the fact that the object has been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: == Stack trace for context 0x5597c9f71170 ==
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #0 0x5597ca40f980 i resource:///org/gnome/shell/ui/popupMenu.js:714 (0x7feedc265f78 @ 22)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #1 0x7fffc0dc0b40 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #2 0x7fffc0dc0bf0 b resource:///org/gnome/shell/ui/popupMenu.js:734 (0x7feedc2672b8 @ 23)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #3 0x7fffc0dc0c50 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #4 0x5597ca40f8f8 i resource:///org/gnome/shell/ui/popupMenu.js:750 (0x7feedc2673c8 @ 32)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #5 0x7fffc0dc1810 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #6 0x7fffc0dc18e0 b resource:///org/gnome/gjs/modules/_legacy.js:39 (0x7feedc3c2918 @ 215)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #7 0x5597ca40f870 i resource:///org/gnome/shell/ui/popupMenu.js:893 (0x7feedc267890 @ 62)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #8 0x7fffc0dc24f0 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #9 0x5597ca40f7e8 i resource:///org/gnome/shell/ui/panelMenu.js:191 (0x7feedc2f1ef0 @ 53)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #10 0x7fffc0dc30b0 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #11 0x5597ca40f760 i /usr/share/gnome-shell/extensions/apps-menu@gnome-shell-extensions.gcampax.github.com/extension.js:865 (0x7feec8433120 @ 59)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #12 0x5597ca40f6e0 i /usr/share/gnome-shell/extensions/apps-menu@gnome-shell-extensions.gcampax.github.com/extension.js:881 (0x7feec84332b8 @ 48)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #13 0x7fffc0dc43b0 b resource:///org/gnome/shell/ui/extensionSystem.js:82 (0x7feedc2b4230 @ 431)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #14 0x5597ca40f5a0 i resource:///org/gnome/shell/ui/extensionSystem.js:344 (0x7feedc2b4cd0 @ 13)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #15 0x7fffc0dc5130 b self-hosted:251 (0x7feedc3d25e8 @ 223)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #16 0x5597ca40f520 i resource:///org/gnome/shell/ui/extensionSystem.js:343 (0x7feedc2b4c48 @ 63)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #17 0x5597ca40f4a0 i resource:///org/gnome/shell/ui/extensionSystem.js:361 (0x7feedc2b4d58 @ 87)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #18 0x7fffc0dc65a0 b resource:///org/gnome/gjs/modules/signals.js:126 (0x7feedc3e2b38 @ 386)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #19 0x7fffc0dc6d40 b resource:///org/gnome/shell/ui/sessionMode.js:204 (0x7feeca4a41a8 @ 254)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #20 0x7fffc0dc79e0 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #21 0x5597ca40f360 i resource:///org/gnome/shell/ui/sessionMode.js:166 (0x7feeca49eef0 @ 40)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #22 0x7fffc0dc85a0 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #23 0x5597ca40f2b8 i resource:///org/gnome/shell/ui/screenShield.js:1281 (0x7feeca4781a8 @ 188)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #24 0x7fffc0dc9160 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #25 0x5597ca40f208 i resource:///org/gnome/shell/ui/screenShield.js:1327 (0x7feeca478230 @ 391)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #26 0x7fffc0dc9d20 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #27 0x5597ca40f160 i resource:///org/gnome/shell/ui/shellDBus.js:462 (0x7feeca489560 @ 82)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #28 0x7fffc0dca8f0 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7feedc3c2bc0 @ 71)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #29 0x5597ca40f098 i resource:///org/gnome/gjs/modules/overrides/Gio.js:300 (0x7feedc206230 @ 614)
Mar 07 14:24:44 localhost /usr/lib/gdm/gdm-x-session[2826]: #30 0x5597ca40eff0 i resource:///org/gnome/gjs/modules/overrides/Gio.js:331 (0x7feedc206450 @ 34)