On his second debut for Grays, Slabber scored a hat-trick in their 7–0 win at home to Maldon Town in the Essex Senior Cup. Slabber scored the only goal in Grays' 1–0 win over Ebbsfleet United on 26 December 2008, with a header set-up from a pass by Wesley Thomas. His second goal for Grays in the Conference National during the 2008–09 season was in the 2–1 home victory against Altrincham on 7 March 2009, having met Bradley Hudson-Odoi's cross. Slabber scored in Grays' 2–1 victory over Mansfield Town, scoring with a header from a cross supplied by George Beavan. He re-signed for Grays in July, after leaving at the end of the season.