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Only JSON-based variables can be use with set and unset. Unfortunately, this restriction is not checked. If an invalid variable is given (e.g. $invalid), this is not detected upon config processing on startup. During execution phase, this can lead to a segfault, a memory leak or other types of problems. see also https://github.com/rsyslog/rsyslog/issues/1376 closes https://github.com/rsyslog/rsyslog/issues/1377