Error in RuleCondition on 4.6: unsupported operand types

[20-Jun-2018 11:13:32 Europe/Brussels] PHP Fatal error: Unsupported operand types in /home/xxcivi1/public_html/sites/default/files/civicrm/ext/org.civicoop.civirules/CRM/Civirules/Form/RuleCondition.php on line 124

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