Segmentation Fault (core dumped)for dense_slam_gui.py

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [x] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### Describe the issue

I have been trying to run examples/python/t_reconstruction_system/dense_slam_gui.py for real-time 3D reconstruction. The Open3D Reconstruction GUI is normally set up(as shown in the Additional information). However, every time I run the code within a few seconds, it results in a segmentation fault (core dumped) (as shown in the Additional information).

### Steps to reproduce the bug

```python
$ cd ~/Downloads/Open3D-0.17.0/examples/python/t_reconstruction_system
$ python3 dense_slam_gui.py --device 'cuda:0'
```

### Error message

wenqing@amax:~/Downloads/Open3D-0.17.0/examples/python/t_reconstruction_system$ python3 dense_slam_gui.py --device 'cuda:0'
Config file was not provided, falling back to default dataset.
Loaded data from /home/wenqing/open3d_data/extract/LoungeRGBDImages
FEngine (64 bits) created at 0x7fd13003c010 (threading is enabled)
FEngine resolved backend: OpenGL
Segmentation fault (core dumped)

### Expected behavior

I expect that dense_slam_gui.py can be run for real-time 3D reconstruction like the followings official video:
https://www.youtube.com/watch?v=pLCVCH7ypI4

### Open3D, Python and System information

```markdown
- Operating system: Ubuntu 20.04
- Python version: Python 3.8.4
- Open3D version: output from python: 0.17.0
- System architecture: x86_64
- Is this a remote workstation?: yes or no
- How did you install Open3D?: pip
```

### Additional information

Open3D Reconstruction is normally set up as followings:
However, switch "Resume/Pause", run a few seconds, and crash with the error as followings: