Airships: Lost Flotilla

Whenever I try to complete research for the Izegbe, the game crashes. This is the log Lutris gave me:

Started initial process 323 from gamemoderun ./AirshipsLostFlotilla
Start monitoring process.
Launching...
Initialize
Loaded Prefs
System.Collections.Generic.KeyNotFoundException: The given key 'izegbe' was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Survivors.ManualGUI.DoResearchUnlocks(String topic, SGame g) in /home/zar/Desktop/Projects/Survivors/Survivors/Manual.cs:line 862
   at Survivors.ManualGUI.DoDraw(SGame g, SpriteBatch sb, Int32 ms) in /home/zar/Desktop/Projects/Survivors/Survivors/Manual.cs:line 470
   at Survivors.GUIScreen.Draw(SGame g, Int32 ms) in /home/zar/Desktop/Projects/Survivors/Survivors/GUIScreen.cs:line 20
   at Survivors.SGame.Draw(GameTime gameTime) in /home/zar/Desktop/Projects/Survivors/Survivors/SGame.cs:line 2257