crash on startup screen when trying to open file or folder after upgrade to 1.29

I've upgraded visual studio code with flatpak and since then I can't use it any more. It's always crashing when I try to click on "open folder" or "add workspace" etc

If I run vscode from shell in devel mode:
```
sh-4.4$ LANG=C /app/extra/vscode/code
Gtk-Message: 19:53:19.760: Failed to load module "pk-gtk-module"
Gtk-Message: 19:53:19.760: Failed to load module "canberra-gtk-module"
Gtk-Message: 19:53:19.760: Failed to load module "pk-gtk-module"
Gtk-Message: 19:53:19.760: Failed to load module "canberra-gtk-module"
[main 7:53:20 PM] update#setState idle
sh: cannot set terminal process group (-1): Inappropriate ioctl for device
sh: no job control in this shell

(code:119): Gtk-WARNING **: 19:53:24.543: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.
**
Gtk:ERROR:../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /run/host/share/icons/Paper/16x16/status/image-missing.png: Error opening file /run/host/share/icons/Paper/16x16/status/image-missing.png: No such file or directory (g-io-error-quark, 1)
Cannot upload crash dump: cannot exec /usr/bin/wget
Server response:
Abandon (core dumped)
```

Any idea ? It was working fine before 1.29.

I try to repair, remove/reinstall etc same results.
Using vscode 1.29 from RPM is working fine.

Version: 1.29.0
Commit: 5f24c93878bd4bc645a4a17c620e2487b11005f9
Date: 2018-11-12T07:42:27.562Z
Electron: 2.0.12
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
Architecture: x64

Best regards,
Edouard