Generally, chasing losses in gambling is not advisable. But there are certain situations that it might not be too bad for you to chase a loss
1) Not exceeding your gambling budget: When you have a fixed budget and you have gambled and lost. And your rationally fixed gambling budget is not exceeded, you can go ahead to chase the loss till you reach your budget.
2) When your losses are small: When your losses are not big and you have the same amount you can afford to loose, it would not be out of place to chase your losses a little bit.
1) Not exceeding your gambling budget: When you have a fixed budget and you have gambled and lost. And your rationally fixed gambling budget is not exceeded, you can go ahead to chase the loss till you reach your budget.
2) When your losses are small: When your losses are not big and you have the same amount you can afford to loose, it would not be out of place to chase your losses a little bit.