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Error during Plesk upgrade to Obsidian 18.0.37: PHP Fatal error: Uncaught JMS\Serializer\Exception\RuntimeException: Could not decode JSON, syntax error - malformed JSON.

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Martin Dias
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Plesk for Linux kb: bug

Applicable to:

  • Plesk for Linux

Symptoms

During a Plesk upgrade to Plesk Obsidian 18.0.37, the following error is shown:

PLESK_INFO: ERROR: Upgrade step 2021-07-01-11-34-45_TrimPlanNames.php failed with code 255 and output:
PHP Fatal error: Uncaught JMS\Serializer\Exception\RuntimeException: Could not decode JSON, syntax error - malformed JSON. in /usr/local/psa/admin/plib/vendor/jms/serializer/src/JsonDeserializationVisitor.php:240

Cause

Plesk bug PPPM-13114, which will be fixed in future product updates.

Resolution

The error may be safely ignored.

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