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-rw-r--r--src/post-refinement.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/post-refinement.c b/src/post-refinement.c
index e0436d8a..45966eb8 100644
--- a/src/post-refinement.c
+++ b/src/post-refinement.c
@@ -291,7 +291,11 @@ static void apply_shift(Crystal *cr, int k, double shift)
} else {
t = crystal_get_osf(cr);
t += shift;
- crystal_set_osf(cr, t);
+ if ( t < 0.0 ) {
+ ERROR("Refusing to make OSF negative.\n");
+ } else {
+ crystal_set_osf(cr, t);
+ }
}
break;