title: Error Number: 1364 Field 'modified_at' doesn't have a default value
body: <p>when i try to make stricton value to <strong>TRUE</strong> then it shows error <code>Error Number: 1364  Field 'modified_at' doesn't have a default value"</code> and when try to make it <strong>FALSE</strong> then it shows error </p>
  
  <pre><code>Variable 'sql_mode' can't be set to the value of 'REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE( @@sql_mode'
  SELECT GET_LOCK('ad3549572403a9c71bea1109d26f4b48', 300) AS ci_session_lock
  </code></pre>
  
  <p>when the value is true, everything is working but i need to refresh to make error: "Error Number: 1364  Field 'modified_at' doesn't have a default value" gone.
  please help me to overcome this fault.
  thank uu!</p>
  
  <p>Here is the screenshot of the errors:</p>
  
  <p><a href="https://i.stack.imgur.com/1CHKI.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p><a href="https://i.stack.imgur.com/VICiT.png" rel="nofollow noreferrer">enter image description here</a></p>