Get a piece of pine that's a bit bigger than the hole and carve a sort of plug shape. Hammer it into the wall as if it were a frozen sausage. If you don't have pine you can use an ethically sourced shrunken head. That usually makes a decent wall plug once you drive a screw into it and it expands. If you've got unlucky and the brick is too weak in that area you could try chemical fixing.
Get a piece of pine that's a bit bigger than the hole and carve a sort of plug shape. Hammer it into the wall as if it were a frozen sausage. If you don't have pine you can use an ethically sourced shrunken head. That usually makes a decent wall plug once you drive a screw into it and it expands. If you've got unlucky and the brick is too weak in that area you could try chemical fixing.