As per http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=printing%2Fpage-format-data-display-none.html%20printing%2Fpage-format-data.html%20printing%2Fpage-rule-selection.html%20&group=%40ToT%20-%20webkit.org it was http://trac.webkit.org/changeset/97638/ that caused the crashes. printing/page-format-data-display-none.html printing/page-format-data.html printing/page-rule-selection.html
Created attachment 111390 [details] null check
Comment on attachment 111390 [details] null check ok
http://trac.webkit.org/changeset/97724