Issue and Steps to Reproduce

I just woke up and checked, and yesterday there were three crashes in a row when it sync'd with the blockchain. Except for the version line, I only include the part of the log from end of sync to end of crash.

crash_after_sync_crash1.txt
crash_after_sync_crash2.txt
crash_after_sync_crash3.txt

getinfo output

Here's the version on all three:

2018-03-01T22:10:23.390Z lightningd(7188): Server started with public key 031c527494f295220d26a1814c18e7db3f4f03203ce1a53a0b74b52ed570a3972a, alias Plasma???Genesis (color #031c52) and lightningd v0.5.2-2016-11-21-2158-g9504a77
2018-03-01T23:31:05.746Z lightningd(15417): Server started with public key 031c527494f295220d26a1814c18e7db3f4f03203ce1a53a0b74b52ed570a3972a, alias Plasma???Genesis (color #031c52) and lightningd v0.5.2-2016-11-21-2158-g9504a77
2018-03-02T00:52:44.465Z lightningd(12189): Server started with public key 031c527494f295220d26a1814c18e7db3f4f03203ce1a53a0b74b52ed570a3972a, alias Plasma???Genesis (color #031c52) and lightningd v0.5.2-2016-11-21-2158-g9504a77