Pagination signout when click next page

Question

Whenever I click the next page in pagination icon/button,its jumped to signout.

 

Please advice and help me to clear this.

$showRecordPerPage = 5;
if(isset($_GET['page']) && !emptyempty($_GET['page'])){
$currentPage = $_GET['page'];
}else{
$currentPage = 1;
}
$startFrom = ($currentPage * $showRecordPerPage) - $showRecordPerPage;
$totalEmpSQL = "SELECT * FROM feedback where id !='' and name!='' ";
$allEmpResult = mysqli_query($link, $totalEmpSQL);
$totalEmployee = mysqli_num_rows($allEmpResult);
$lastPage = ceil($totalEmployee/$showRecordPerPage);
$firstPage = 1;
$nextPage = $currentPage + 1;
$previousPage = $currentPage - 1;
html code:
---------------
<nav aria-label="Page navigation">
<ul class="pagination">
<?php if($currentPage != $firstPage) { ?>
<li class="page-item">
<a class="page-link" href="?page=<?php echo $firstPage ?>" tabindex="-1" aria-label="Previous">
<span aria-hidden="true">First</span>
</a>
</li>
<?php } ?>
<?php if($currentPage >= 2) { ?>
<li class="page-item"><a class="page-link" href="feedbacklist.php?page=<?php echo $previousPage ?>"><?php echo $previousPage ?></a></li>
<?php } ?>
<li class="page-item active"><a class="page-link" href="feedbacklist.php?page=<?php echo $currentPage ?>"><?php echo $currentPage ?></a></li>
<?php if($currentPage != $lastPage) { ?>
<li class="page-item"><a class="page-link" href="feedbacklist.php?page=<?php echo $nextPage ?>"><?php echo $nextPage ?></a></li>
<li class="page-item">
<a class="page-link" href="feedbacklist.php?page=<?php echo $lastPage ?>" aria-label="Next">
<span aria-hidden="true">Last</span>
</a>
</li>
<?php } ?>
</ul>
</nav>