title: Cannot insert duplicate key row in object 'dbo.TitleClient' with unique index 'XAK1TitleClient'
body: <p>Ever since I cleaned the data on the SQL Database I've been getting this issue, whereas on the unclean database the issue does not happen. When I run my stored procedure (huge procedure) it returns:</p>
  
  <pre><code>General SQL error. Cannot insert duplicate key row in object 'dbo.TitleClient' with unique index 'XAK1TitleClient'. Cannot insert the value NULL into column 'id_title', table 'Database.dbo.TitleCom'; column does not allow null, insert fails.
  </code></pre>
  
  <p>Is it possible that I deleted data from a table that <strong>causes</strong> this? Or is that impossible?</p>