Error when opening Actor sheets

[scooper4711]

Running Foundry 0.8.8, I get the following error in the console when I open actor sheets;

TypeError: Cannot read property 'length' of undefined
    at JournalLink.includeLinks (journallink.js:123)
    at JournalLink.includeActorLinks (journallink.js:109)
    at Function._call (eval at <anonymous> (listeners.js:56), <anonymous>:4:14)
    at Function.call (foundry.js:179)
    at HarnMasterCharacterSheet._render (foundry.js:2097)
    at async HarnMasterCharacterSheet._render (foundry.js:2729)

It doesn't seem to have any adverse effects.

[scooper4711]

I'm running the Harnmaster 3 game system if that matters.