{"action":"opened","issue":{"url":"https://api.github.com/repos/abhinavguptas/Salesforce-Lookup-Rollup-Summaries/issues/12","labels_url":"https://api.github.com/repos/abhinavguptas/Salesforce-Lookup-Rollup-Summaries/issues/12/labels{/name}","comments_url":"https://api.github.com/repos/abhinavguptas/Salesforce-Lookup-Rollup-Summaries/issues/12/comments","events_url":"https://api.github.com/repos/abhinavguptas/Salesforce-Lookup-Rollup-Summaries/issues/12/events","html_url":"https://github.com/abhinavguptas/Salesforce-Lookup-Rollup-Summaries/issues/12","id":56691404,"number":12,"title":"MISSING_ARGUMENT, Id not specified in an update call","user":{"login":"jbower-esc","id":10852527,"avatar_url":"https://avatars.githubusercontent.com/u/10852527?v=3","gravatar_id":"","url":"https://api.github.com/users/jbower-esc","html_url":"https://github.com/jbower-esc","followers_url":"https://api.github.com/users/jbower-esc/followers","following_url":"https://api.github.com/users/jbower-esc/following{/other_user}","gists_url":"https://api.github.com/users/jbower-esc/gists{/gist_id}","starred_url":"https://api.github.com/users/jbower-esc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jbower-esc/subscriptions","organizations_url":"https://api.github.com/users/jbower-esc/orgs","repos_url":"https://api.github.com/users/jbower-esc/repos","events_url":"https://api.github.com/users/jbower-esc/events{/privacy}","received_events_url":"https://api.github.com/users/jbower-esc/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-02-05T16:17:41Z","updated_at":"2015-02-05T16:17:41Z","closed_at":null,"body":"I have situations where the lookup field may be blank on my child records.  However, when this is the case, I receive the subject error.  I have tried to only execute the update statement in the trigger when the lookup field is available, but any combination I try, I don't get the expected results.  I feel I am missing something obvious.  Does the class assume the lookup field is populated?  Or does it gracefully handle if the lookup field is not populated?  If not, what's the recommended approach for skipping the rollup/update?\r\n\r\nThanks,\r\nJB"}}