src/main/java/org/apache/log4j/receivers/varia/LogFilePatternReceiver.java [546:553]:
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  private boolean passesExpression(LoggingEvent event) {
    if (event != null) {
      if (expressionRule != null) {
        return (expressionRule.evaluate(event, null));
      }
    }
    return true;
  }
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src/main/java/org/apache/log4j/receivers/xml/LogFileXMLReceiver.java [147:154]:
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    private boolean passesExpression(LoggingEvent event) {
        if (event != null) {
            if (expressionRule != null) {
                return (expressionRule.evaluate(event, null));
            }
        }
        return true;
    }
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