According to https://mailman-1.sys.kth.se/pipermail/gromacs.org\_gmx-users/2018-May/120400.html it seems that gmx enemat is not robust to being supplied an energy file that does not have energygrps. It should give a graceful message that it can’t do its job with such input. *(from redmine: issue id 2508, created on 2018-05-21 by mark.j.abraham, closed on 2018-06-05)* * Changesets: * Revision f76f70fba009395839e2dae0dcd81db8865698dd by Mark Abraham on 2018-06-05T12:32:21Z: ``` Fixed enemat when .edr had no matching energy groups Removed some debug output that obscured both the code and the useful user-facing warnings. Used a simpler bool construct to decide whether to issue the warning. Fixes #2508 Change-Id: Ife56264991e365f8f5ca3b1285caea8033da7584 ```