Error: STOP ETRACK<XM

Dear Fluka experts,

a few of my FLUKA jobs fail with an error message I cannot interpret:

Abort called from MAGNEW reason ETRACK<XM. Run stopped!
STOP ETRACK<XM.

here is an example:
ESeptum_SIS100_02.inp (110.6 KB)
ESeptum_SIS100_02001.err (230.5 KB)
ESeptum_SIS100_02001.log (138 Bytes)
ESeptum_SIS100_02001.out (1.9 MB)
ranESeptum_SIS100_02001.ran (1.6 KB)
ranESeptum_SIS100_02002.ran (1.6 KB)

the following files were linked via ldpmqmd:
source_ESeptum_SLOW.f (8.9 KB)
mgdraw_killPrimaries.f (9.6 KB)
usrmed_killPrimaries.f (3.6 KB)
ftelos_killPrimaries.f (1.3 KB)
kilcnt.inc (810 Bytes)

Best regards
Roman

Dear Roman,

Thanks for reporting. Your input indeed probed a rare bug (a corner case where ions experienced a round-off excursion at zero kinetic energy while turning around in an opposing electric field), which has now been fixed and will be included in an upcoming minor release before the end of the year.

With kind regards,

Cesc