Bug report: PHP Notice for an undefined index in logger

Bug report

Plugin version: 1.4.7

Description: This message is outputted when I add a single product to my cart on the product page.

Error:

PHP Notice: Undefined index: function in /var/www/html/wordpress/wp-content/plugins/activecampaign-for-woocommerce/includes/class-activecampaign-for-woocommerce-logger.php on line 261

The function in the file:

/**
  * Replaces the trace array with a clean version that only contains specific details.
  *
  * @param array $trace The stack trace.
  *
  * @return array The replacement stack trace.
  */
public function clean_trace( $trace ) {
  $result = [];

  // Only retrieve class, function, and line for the first 3 trace results
  if ( isset( $trace[0]['class'] ) ) {
    $result[0]['class'] = $trace[0]['class'];
  }
  if ( isset( $trace[0]['function'] ) ) {
    $result[0]['function'] .= $trace[0]['function']; // <<<<<<<<<<<<<<<<<<<<<<
  }

  if ( isset( $trace[0]['line'] ) ) {
    $result[0]['line'] = $trace[0]['line'];
  }

  if ( isset( $trace[1]['class'] ) ) {
    $result[1]['class'] = $trace[1]['class'];
  }

  if ( isset( $trace[1]['function'] ) ) {
    $result[1]['function'] = $trace[1]['function'];
  }

  if ( isset( $trace[1]['line'] ) ) {
    $result[1]['line'] = $trace[1]['line'];
  }

  if ( isset( $trace[2]['class'] ) ) {
    $result[2]['class'] = $trace[2]['class'];
  }

  if ( isset( $trace[2]['function'] ) ) {
    $result[2]['function'] = $trace[2]['function'];
  }

  if ( isset( $trace[2]['line'] ) ) {
    $result[2]['line'] = $trace[2]['line'];
  }

  return $result;
}

The specified line should be changed to:

$result[0]['function'] = $trace[0]['function'];