ID de contrato no recibido.
<div class="row">
    <div class="col-md-6">
        <div class="row">
            <div class="col-md-12">
                <label for="nombre"><small><b>Nombre</b></small></label>
                <input type="text" id="nombre" name="nombre" class="form-control" value="<br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>51</b><br />
" readonly>
            </div>        
        </div>
        
    </div>
</div>
<div class="row mt-5">
    <div class="col-md-12">
        <div class="card">
            <div class="card-header">
                <h5>Contrato</h5>
            </div>
            <div class="card-body">




                <table id="clientesTablePago" class="table table-striped">
                    <thead>
                        <tr>
                            <th>#</th>
                            <th>N° Contrato</th>  
                            <th>Año</th>                                                                                     
                            <th>Acciones</th>
                        </tr>
                    </thead>
                    <tbody>
                   
                        <tr>
                            <td><br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>80</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>80</b><br />
</td>                            
                            <td>
                                No se ha regitrado un contrato aún                            </td>
                           
                            <td><br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>93</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>93</b><br />
</td>  
                            <td><br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>94</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>94</b><br />
</td>                                       
                            <td>
                                <button type="button" class="btn btn-success btn-agregar-pago mt-3">Agregar Contrato</button>                                
                            </td>
                        </tr>
                 
                    </tbody>
                </table>
                
            </div>
        </div>
    </div>
</div>
<div class="row mt-5">
    <div class="col-md-12">
        <div class="card">
            <div class="card-header">
                <h5>Auditores</h5>
            </div>
            <div class="card-body">
                <table id="clientesTablePago" class="table table-striped">
                    <thead>
                        <tr>
                            <th>#</th>
                            <th>Rol</th>
                            <th>Nombre</th>
                            <th>Firma</th>                                    
                            <th>Acciones</th>
                        </tr>
                    </thead>
                    <tbody>                  
                        <tr>
                            <td><br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>135</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>135</b><br />
</td>
                            <td>Auditor Encargado</td>
                            <td><br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>137</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>137</b><br />
</td>
                            <td><br />
<b>Warning</b>:  Undefined variable $cliente in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>138</b><br />
<br />
<b>Warning</b>:  Trying to access array offset on value of type null in <b>/var/www/html/aliado-test/apanel/audit/get_contrato copy.php</b> on line <b>138</b><br />
</td>                                    
                            <td>
                                <button type="button" class="btn btn-success btn-agregar-pago mt-3">Agregar Auditor</button>                            </td>
                        </tr>                   
                    </tbody>
                </table>
                
            </div>
        </div>
    </div>
</div>