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Unable access active migration session in Plesk: version_compare(): Argument #1 ($version1) must be of type string, array given.

Alex Tsmokalyuk

Updated July 14, 2025 15:20

kb: bug Plesk for Linux ext: migrator Plesk Migrator Migration

Symptoms

Unable to open active migration session (Tools & Settings > Migration & Transfer Manager > IP_address_of_the_source_server) in Plesk Migrator after extension update:

PLESK_INFO: version_compare(): Argument #1 ($version1) must be of type string, array given

Server error 500:

Cause

Plesk Migrator extension bug #PMT-5634, a fix has been released in extension version 2.29-1.

Resolution

Install the latest Plesk Migrator update.

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