Issue and Steps to Reproduce

When starting lightningd it crashes every time once it reaches the current block

getinfo output

lightning getinfo
{ "id" : "02a217f391cfc2835c56204b30a174bb21bc9ca018089ebc1e6bb7ddd8b754483d", "port" : 9735, "address" :
[
{ "type" : "ipv4", "address" : "68.201.163.28", "port" : 9735 } ], "version" : "v0.5.2-2016-11-21-2168-gcb6820d", "blockheight" : 511535, "network" : "bitcoin" }

LINK TO CRASH.LOG: https://docs.google.com/document/d/1ati6FJ1CkyOoLqWrFteyQFzYxh6CRXQNqA2FZKYDTe4/edit?usp=sharing