Plugin failed to restore player's data after server crash

[Icohedron]

If the server crashes, some player data may sometimes not be recoverable after they reconnect to the server.
In this case, the player's data in 'config/adminmode/amplayerdata.dat' should still contain mostly human-readable data which can be used to manually restore the player's data (e.g. using the '/give' command).

No idea why or what corrupt/non-serializable data is being written to amplayerdata.dat. If I had it, then I could work on a fix.