Ahkeem Rose scored eight minutes into added-time to earn Weymouth a 1-1 draw and prevent Chesterfield going top in Paul Cook’s first game back in charge.
Cook’s return to the Spireites looked to be starting in style after Alex Whittle’s 70th-minute opener had them on course to leapfrog National League leaders Stockport.
But 12 minutes of added time were announced after Chesterfield’s Kabongo Tshimanga was carried off on a stretcher with a serious-looking knee injury.
And Rose struck as the game approached a century of minutes to earn struggling Weymouth just a third point in their last 13 league matches.
Chesterfield sit level on points with Stockport having now played the same amount of games and trail by three on goal difference.
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.