Hello, I encountered one more issue at stellaris-dashboard-0.6.1.
In some galaxy, it aborts when every update. In the log,

2019-11-24 22:32:06,370 - stellarisdashboard.timeline - ERROR - 45_773905773 2205.07.01 Rolling back changes to database...
Traceback (most recent call last):
File "C:\Users\user\Documents\Paradox Interactive\stellaris-dashboard-0.6.1\stellarisdashboard\timeline.py", line 63, in process_gamestate
self._process_gamestate(db_game)
File "C:\Users\user\Documents\Paradox Interactive\stellaris-dashboard-0.6.1\stellarisdashboard\timeline.py", line 111, in _process_gamestate
{key: all_dependencies[key] for key in data_processor.DEPENDENCIES}
File "C:\Users\user\Documents\Paradox Interactive\stellaris-dashboard-0.6.1\stellarisdashboard\timeline.py", line 366, in extract_data_from_gamestate
network_id = hash(frozenset(connections) | {bypass_id})
TypeError: 'NoneType' object is not iterable

I did some search myself, and find issued galaxy have only one gataway.
I figure it (id=1 bypass, without any connection) cause this issue.

From gamestate:
bypasses={
0={
type="lgate"
active=no
owner={
type=6
id=0
}
}
1={
type="gateway"
active=no
owner={
type=6
id=2
}
}
184549378=none
3={
type="wormhole"
active=yes
linked_to=4
connections={
4
}
active_connections={
4
}
owner={
type=7
id=0
}
}

I tend to play with tiny galaxy with Abandoned Gateways 1X game settings. I use many other mods, while none of them aim for gateway setting, some might remove gateway.
This issue might not happen in vanilla games, and I figure it won't happen in my mod setting with higher Abandoned Gateways setting.
I report it just because it won't harm anybody but might help somebody.