Image source, PA

The second half kicks off, and a chorus of whistles erupts once again.

There haven't been many chances in this game, but there's been plenty of action off it as Charlton fans protest against owner Roland Duchatelet.

A walkout is planned for the 74th minute as well, but what else could we see in the second half?

Big news out of Nottingham Forest, where manager Dougie Freedman has been sacked after 13 months in charge at the City Ground.

Forest are 14th in the table after Saturday's 3-0 defeat by Sheffield Wednesday.

So, what did you make of that half? We'd love to hear your thoughts, whether they're about the action on the field or the protests off it.

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That Fanni header is the closest we've come to a goal, as the two sides go into the dressing rooms all tied up.

A draw wouldn't really suit either side, so hopefully we'll see some attacking changes in the second half.

Incredible stuff. Charlton right-back Rod Fanni sends a thumping header towards his own goal, which somehow is kept out by the boot of Nick Pope. 

Pope didn't know too much about that one, but the scores remain level.

Five minutes of added time to play at the Valley after a string of disruptions. 

Jordan Rhodes is desperately isolated up front for Middlesbrough, who still look a little vulnerable to Charlton when they launch a rare counter attack.

Middlesbrough are lacking a cutting edge to make use of their possession - could we see David Nugent brought off the bench at half-time?

Charlton can't get hold of the ball, but they don't seem too worried when their opponents get inside their half either.

They aren't having much of the possession, but Charlton look threatening when they go on the attack.

Callum Harriott makes himself a bit of space, before sending a left-footed shot sailing over the bar.

There's no rhythm to the game, but the sides aren't being helped by a string of delays.

Charlton's Johann Berg Gudmondsson is receiving treatment after a clash of heads with Middlesbrough defender George Friend.

Middlesbrough are in control, having the better of the possession and territory.

The Teessiders haven't really crafted many chances as yet, with the final pass consistently getting cut out by the Charlton defence.

Image source, Rex Features

The Phantom Whistler strikes again, and this time referee Darren Deadman calls a halt to proceedings.

We're quickly back under way, inevitably to a chorus of whistles. 

Gaston Ramirez springs forward again for the visitors, but his run is halted by the referee's whistle.

Except it turns out it wasn't the referee's whistle, rather one which came from somewhere in the crowd.

Moments later, Johann Berg Gudmondsson tests Middlesbrough keeper Dimi Konstantopoulos from outside the area.

...apart from a goal in the Championship, apparently.

The second of our FA Cup games is close to kick-off, following Watford's win over Arsenal. You can follow Tom Rostance's live coverage here. 

Middlesbrough's first real opportunity of the game comes through Gaston Ramirez's run and shot.

The Uruguay forward's effort is tamely struck and straight at Nick Pope in the Charlton goal.

Over 100 minutes of Championship football so far today, and still no goals.

There aren't any signs of one either, with both sides content to pass the ball around at the back.

It's a bit of a cagey start from both teams, but Charlton are certainly matching their promotion-chasing opponents so far.

Johann Berg Gudmondsson whips a decent delivery in to the box from a free-kick, but Middlesbrough keeper Dimi Konstantopoulos comes away with the ball.

Charlton craft their first opening of the game, but Emilio Nsue reacts sharply to take the ball away from Ademola Lookman.

A bright start from Middlesbrough left-back George Friend as he charges forward down the wing, before sending a dangerous low cross into the Charlton box.

The hosts clear the ball away, with Jordan Rhodes waiting to pounce in front of goal.

Beach balls cleared, the match starts again with a drop ball returned to Charlton keeper Nick Pope.

The Addicks are in red shirts, white shorts, while Middlesbrough are in their yellow away kit.