slimstat_track_exit_102
This process is triggered by the Javascript tracker when the browser sends data that is not correctly formatted.
Here’s what happens:
- The script checks if the required data (id and op) is missing or empty.
 - If the data is not well-formed:
- It triggers the 
slimstat_track_exit_102action. - It sets the error code to -102.
 - It records an error message advising to clear the WordPress cache: “Invalid payload string. Try clearing your WordPress cache.”
 - It saves the current options.
 - It exits with the error code -102.0.
 
 - It triggers the 
 
Here’s the code:
if ( empty( self::$data_js[ 'id' ] ) || empty( self::$data_js[ 'op' ] ) ) {
	do_action( 'slimstat_track_exit_102' );
	self::$stat[ 'id' ] = -102;
	self::_set_error_array( __( 'Invalid payload string. Try clearing your WordPress cache.', 'wp-slimstat' ) );
	self::slimstat_save_options();
	exit('-102.0');
}