Liquid template doesn't properly render input

[marko-asplund]

commit_msg_checker.rb service renders its output in the following manner:

Commits pushed to the repository contained invalid commit messages.

Please see Liquid error: undefined method `to_liquid' for #Java::JavaUtil::LinkedHashMap:0x228815e9 for commit message guidelines.

Push event info

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repository: Liquid error: undefined method to_liquid' for #<Java::JavaUtil::LinkedHashMap:0x228815e9> reference: Liquid error: undefined methodto_liquid' for #Java::JavaUtil::LinkedHashMap:0x228815e9
push date: Liquid error: undefined method to_liquid' for #<Java::JavaUtil::LinkedHashMap:0x228815e9> pusher: Liquid error: undefined methodto_liquid' for #Java::JavaUtil::LinkedHashMap:0x228815e9

Commits

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Liquid error: undefined method `to_liquid' for #Java::JavaUtil::LinkedHashMap:0x228815e9