Bootstrap nav-tabs not working with php script - php

Question

My nav-tabs works fine using static data for my dropdown list but when I add the script to populate the dropdown list, the tabs don't work anymore.
I don't think there's any problem with the query since the list gets populated. Probably with the echo?
<div class="nav-tabs-custom">
<ul class="nav nav-tabs">
<li class="active">Boarding House Info</li>
<li>Other Info</li>
<li>Location</li>
</ul>
<div class="tab-content">
<div class="tab-pane active" id="tab_1">
<div class="box-body">
<div class="form-group">
<label for="boarding-house-name">Boarding House Name</label>
<input type="text" class="form-control" id="bh-name" name="bh-name" placeholder="boarding house name">
</div>
<div class="form-group" style="margin-bottom:50px">
<label for="price">Price</label><br>
<div class="col-md-2" style="margin-left:-15px;">
<input type="text" class="form-control" id="pricemin" name="bh-pricemin" placeholder="min">
</div>
<div class="col-md-2" style="margin-left:-15px;">
<input type="text" class="form-control" id="pricemax" name="bh-pricemax" placeholder="max">
</div>
</div>
<div class="form-group">
<label for="address">Address</label>
<input type="text" class="form-control" id="address" name="bh-address" placeholder="address">
</div>
<div class="form-group">
<label for="barangay">Barangay</label>
<select class="form-control" name="bh-barangay">
<option value="Brgy 1">Brgy 1</option>
<option value="Brgy 2">Brgy 2</option>
<option value="Brgy 3">Brgy 3</option>
<option value="Brgy 4">Brgy 4</option>
</select>
</div>
<div class="form-group">
<label for="contactperson">Contact Person</label>
<input type="text" class="form-control" id="contactperson" name="bh-contactperson" placeholder="contact person">
</div>
<div class="form-group">
<label for="contactnumber">Contact Number</label>
<input type="text" class="form-control" id="contactnumber" name="bh-contactnumber" placeholder="contact number">
</div>
<div class="form-group">
<label for="owner">Owner</label>
<select class="form-control" name="bh-owner-id">
<?php
$query = "SELECT id_owner, owner_name FROM tbl_owner";
$result = $conn->query($query) or die("Connection failed: " . $conn->connect_error);
while($row = mysqli_fetch_assoc($result)) {
echo "<option value='".$row['id_owner']."'>".$row['owner_name']."</option>";
} mysql_free_result($result);
?>
</select>
</div>
</div>
</div>
<div class="tab-pane" id="tab_2">
<div class="box-body">
<div class="form-group">
<label for="tenant" style="margin-bottom:-15px;">Tenant</label>
<div class="checkbox">
<label class="checkbox-inline">
<input type="checkbox" id="tenant_checkbx" value="Male"> Male
</label>
<label class="checkbox-inline">
<input type="checkbox" id="tenant_checkbx" value="Female"> Female
</label>
</div>
</div>
<div class="form-group" style="margin-bottom:50px">
<label for="specification">Specification</label><br>
<div class="col-md-6" style="margin-left:-15px;">
<select class="form-control">
<option>Boarding House</option>
<option>Dormitory</option>
<option>Apartelle</option>
<option>Lodge</option>
<option>Motel</option>
</select>
</div>
</div>
<div class="form-group" style="margin-bottom:50px">
<label for="noofrooms">No. of Rooms</label><br>
<div class="col-md-6" style="margin-left:-15px;">
<input type="text" class="form-control" id="exampleInputEmail1" placeholder="# of rooms">
</div>
</div>
<div class="col-md-2">
<div class="form-group" style="margin-left:-15px;">
<label for="curfew">Curfew</label>
<div class="radio">
<label>
<input type="radio" name="curfew_radio" id="curfew_yes" value="Yes" checked> Yes
</label>
</div>
<div class="radio">
<label>
<input type="radio" name="curfew_radio" id="curfew_no" value="No"> No
</label>
</div>
</div>
</div>
<div class="col-md-2">
<div class="form-group" style="margin-left:-15px;">
<label for="guests">Guests</label>
<div class="radio">
<label>
<input type="radio" name="guests_radio" id="guests_yes" value="Yes" checked> Yes
</label>
</div>
<div class="radio">
<label>
<input type="radio" name="guests_radio" id="guests_no" value="No"> No
</label>
</div>
</div>
</div>
<div class="col-md-2">
<div class="form-group" style="margin-left:-15px;">
<label for="crtype">CR Type</label>
<div class="checkbox">
<label>
<input type="checkbox" id="crtype_checkbx" value="Private"> Private
</label>
</div>
<div class="checkbox">
<label>
<input type="checkbox" id="crtype_checkbx" value="Public"> Public
</label>
</div>
</div>
</div>
</div>
</div>
<div class="tab-pane" id="tab_3">
<div class="box-body">
<!-- INSERT MAP HERE -->
</div>
</div>
</div>
</div>
Here is the query php script I used to populate the owner dropdown list:
<?php
$query = "SELECT id_owner, owner_name FROM tbl_owner";
$result = $conn->query($query) or die("Connection failed: " . $conn->connect_error);
while($row = mysqli_fetch_assoc($result)) {
echo "<option value='".$row['id_owner']."'>".$row['owner_name']."</option>";
} mysql_free_result($result);
?>

Answer 1

It's working now. Did some more debugging with the script and it seems like the line:
mysql_free_result($result);
(after the while condition) is the culprit.
I removed it and the tabs are working now. :)