How to fix this problem incorrect integer value: '' for column 'qual_deg_state_id' at row 1

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HTML

PHP

i have a form in that i am filling the details of cand 10th,12th,diploma,ug and pg details.i am inserting the data using dynfields array.my problem is if i provide all the details data inserting successfully.but if i fill only single qualification it is giving

Incorrect integer value: '' for column 'qual_deg_state_id' at row 1

error.i tried to print the data using print_r funciton .it showing data what i am passing usinf front-end remaing values are showing empty,why this is happening please help me how to fix this thanks in advance.

What I have tried:

this is my code for inserting the data

<pre> if ($_POST['dynfields']) {
         foreach ( $_POST['dynfields'] as $key=>$fieldArray ) {
         $boo=$_POST['dynfields'];
         print_r($boo);

             $keys = array_keys($fieldArray);
             $values = array_map("mysql_real_escape_string",$fieldArray);

             $query = mysql_query("INSERT INTO sk_c_qualification (".implode(',',$keys).",qual_cand_id) VALUES ('".implode('\',\'',$values)."','$cand_id')") or die(mysql_error());
         }
     }

//this is my html code

<pre>	<div class="row">
							<div class="col-md-6">
								<div class="form-group">
						        <label>Board/University<font color="red">*</font></label>
						        <input name="dynfields['+1+'][qual_deg_university]" value="<?php echo $cand_10_uni  ?>"class="form-control" title="Min 4 , Max 150 Only Characters" type="text" placeholder="University/Board" required/>
						    </div>
							</div>
							<div class="col-md-6">
								<div class="form-group">
										<label>College<font color="red">*</font></label>
										<input name="dynfields['+1+'][qual_deg_college]" value="<?php echo $cand_10_uni  ?>" class="form-control" pattern="^[a-zA-Z,\s]{4,150}$" title="Min 4 , Max 150 Only Characters" type="text" placeholder="College" required/>
								</div>
							</div>
						</div>
						<div class="row">
							<div class="col-md-4">
								<div class="form-group">
							    <label>Year of Passing<font color="red">*</font></label>
							    <input id="qual_deg_ug_yop" name="dynfields['+1+'][qual_deg_year]" class="form-control">
							  </div>
							</div>
							<div class="col-md-4">
							    <div class="form-group">
							         <label>State<font color="red">*</font></label>
							          <?php
							           //Include database configuration file
							           include('dbConfig.php');

							           //Get all country data
							           $query = $db->query("SELECT * FROM sk_m_states state ORDER BY state ASC");

							           //Count total number of rows
							           $rowCount = $query->num_rows;
							           ?>
							           <select class="form-control" name="dynfields['+1+'][qual_deg_state_id]" id="qual_deg_ug_state"/>
							             <option value="">Select State</option>
							             <?php
							             if($rowCount > 0){
							               while($row = $query->fetch_assoc()){
							                 echo '<option value="'.$row['state_id'].'">'.$row['state'].'</option>';
							               }
							             }else{
							               echo '<option value="">State not available</option>';
							             }
							             ?>
							         </select>
							   </div>
							</div>