Worcester City threw away a 2-1 lead to go down to Braintree in Blue Square South at St George's Lane.
An unchanged City side trailed after Jacob Mingle gave Braintree a 12th-minute lead.
Aaron Farrell equalised after 17 minutes before Josh Emery put Worcester in front early in the second half.
Craig Calver then levelled for Braintree before Sean Marks grabbed the winner four minutes into injury time in Monday's game.
Worcester caretaker manager Carl Heeley told BBC Hereford & Worcester:
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"If you don't defend you lose games of football. I am sick to death with seeing experienced players not doing basic things.
"We have turned a winning situation again into a defeat. We can't keep going behind before we start.
"Offensively we looked like we can score goals but when you score twice at home and get nothing from the game there's something wrong."
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