That node seems to crash my style while trying to execute the following command:

  ele=*  {echo 'ele=${ele}'; set ele_m='${ele|conv:"ft=>m"}'; echo 'ele_m=${ele}'; }

The echo command produces "ele=" in the transcript,

afterwards "java.lang.StringIndexOutOfBoundsException: String index out of range: -1" etc.

The node contains any empty values. "ele" is the only of them my style uses.

Observed in: mkgmap-r4478