Gallagher put his name on the scoresheet for the first time since mid-October, but it was a frustrating afternoon for Charlton Athletic as they let a two-goal lead slip in a 2-2 draw at home to Cardiff City.
The young midfielder netted his sixth goal of the season (he is his team's leading scorer) when he reacted quickest to put them in front early on.
It is now five games without a win for Lee Bowyer's side.
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