Error with manual stamping when Encryption Enabled (Strict Standards)

[Lovegrove]

When I enable this option: ‘Enable PDF File Encryption’

the manual stamper throws this error.

An error occurred while trying to stamp the file!

Strict Standards: Declaration of SetaPDF_Encryptor::_pdf_write_value() should be compatible with SetaPDF::_pdf_write_value(&$value) in /home/…/public_html/…/wp-content/plugins/wp-pdf-stamper/lib/SetaPDF/Encryptor/SetaPDF_Encryptor.php on line 35

The file does get stamped in the background but the page doesn’t show a link to it.

When I make a test purchase the process works fine. The error doesn’t appear when encryption is disabled.

Any advice appreciated.

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WP 4.5.3 / PDF Stamper 4.5.1 (for PHP 5.4+) / WooCommerce 2.6.2

Min Req Checker = IonCube present / Curl Library present / PHP v5.4.28 / PHP Memory limit 256mb

[wzp]

What happens when Strict Standards is turned off?

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