my select field with a disabled attribute is
<select name="gender" id="gender" disabled="disabled">
<option value="">Select Gender</option>
<option value="male">Male</option>
<option value="female">Female</option>
</select>
disabled value not inserting in the database so I wrote
<input type="hidden" name="gender" value="<?php echo $_POST['gender']; ?>">
while value is there, but still showing error
Column 'Gender' cannot be null