Potential errors with PHP 7.0

My webhost has recently updated to PHP 7.0 and provided a plugin to make sure my WordPress site was compatible. Despite PHP 5.4 (or higher)/PHP 7.0 (or higher) being listed under requirements, my webhost’s tool identified the following potential errors:

FILE: /home/…/public_html/wp-content/plugins/wp-piwik/proxy/piwik.php
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FOUND 1 ERROR AFFECTING 1 LINE
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98 | ERROR | INI directive ‘magic_quotes_runtime’ is deprecated since PHP 5.3 and removed since PHP 5.4.
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FILE: /home/…/public_html/wp-content/plugins/wp-piwik/classes/WP_Piwik.php
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FOUND 1 ERROR AFFECTING 1 LINE
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353 | ERROR | Using ‘break’ outside of a loop or switch structure is invalid and will throw a fatal error since PHP 7.0
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I’m unable to use the tool to switch over to PHP 7.0 until no potential errors are detected. Thanks in advance for your help.