Ruby_exception - no implicit conversion of nil into string

so I have this logstash conf-file with a part of ruby code in it that I mainly got though the help from one of you guys (managed to add one thing myself).

  ruby {
        code => '
                e = event.get("[@metadata][theXML][Event][EventData][Data]")
                if e.nil?
                        puts "empty"
                elsif e.kind_of?(Array)
                        e.each { |x|
                                event.set(x["Name"], x["content"])
                        event.set(e["Name"], e["content"])

I need it to work with this EventData part of an xml-File containing Log-Events, kinda looks like that (simplified):

   <Data Name="API">Plugin initialize</Data>
   <Data Name="Result">3221521586</Data>

And it works fine if the EventData part looks like this, also if it's completely empty or if there's only one Data-thing in there ( works fine here means I get an output looking like "API" => Plugin initialize; "Result" => ...).
But I get a ruby_exception (no implicit conversion of nil into String) as soon as it looks like this:

<Data>&lt;string&gt;LOG:  Autovacuum-Launcher startet

So when there are no subfields I guess, just one field called Data. I hoped I could just put another elsif-condition in there, but I don't know how to phrase the condition in this case.
Unfortunately I don't know anything about ruby really, so really glad about any form of help here.

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