The only thing I found, it was installed as dept:
Dep-Install json-c-0.11-4.el7_0.x86_64 @base
Updated libfastjson-0.99.4-2.el7.x86_64 ?
It was was a fresh CentOS 7 container, only node red was installed. So I think, it was installed as a dept of the node red installation. After performing a system wide update, the error was never seen in the debug log. So I think, it comes from the jason Lib maybe.
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