Leading at the break thanks to goals from Callum Paterson and a rocket from Rushian Hepburn-Murphy, Dons allowed the Spireites back into it when Sam Curtis headed one back before Will Grigg haunted his former club with a 94th minute equaliser.
Here’s how we rated the players.
1. How we rated the MK Dons players in the draw with Chesterfield
For a second game in a row, Dons conceded in stoppage time to drop points to a potential promotion rival | Jane Russell
2. Craig MacGillivray - 6.5
Looked assured and confident in the air, made one good stop diving to his left before being beaten by two set-pieces | Jane Russell
3. Luke Offord - 5.5
Made a couple of uncharacteristic mistakes, including giving away a needless free-kick at the end which led to the equaliser | jane Russell
4. Gethin Jones - 6
Didn't look out of place by shifting into the back three | Jane Russell
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