Default database collation is probably set wrong and the table didn't create with UTF8 encoding. Within _comprofiler_plugin_messages ensure the collation for message column is correctly set to utf8mb4_unicode_ci.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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Thanks @krileon, indeed, the collation of _comprofiler_plugin_messages was different from collation of database . I changed the collation from latin1 to utf8mb4_unicode_ci and now everything is ok. The issue is solved.