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-rw-r--r--libcrystfel/src/geometry.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/geometry.c b/libcrystfel/src/geometry.c
index 20084476..25751abb 100644
--- a/libcrystfel/src/geometry.c
+++ b/libcrystfel/src/geometry.c
@@ -524,6 +524,7 @@ static double do_integral(double q2, double zl, double R,
FILE *fh = NULL;
assert(R*R < q2);
+ assert(R > 0.0);
/* Range over which P is different from zero */
k0 = (R*R - q2)/(2.0*(zl+R));