To fix this, you would need to change forum/modules/gallery/post.php at about line 153 from if( $this->ipsclass->input['op'] == 'doaddcomment' ) { $this->process_reply( $this->ipsclass->input['img'] ); } else { $this->reply_form( $this->ipsclass->input['img'] ); } to $img = intval($this->ipsclass->input['img']); if( $this->ipsclass->input['op'] == 'doaddcomment' ) { $this->process_reply($img); } else { $this->reply_form( $img ); }