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-rw-r--r--Carpet/CarpetLib/src/th.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/Carpet/CarpetLib/src/th.cc b/Carpet/CarpetLib/src/th.cc
index 33c748e51..8bd4163e5 100644
--- a/Carpet/CarpetLib/src/th.cc
+++ b/Carpet/CarpetLib/src/th.cc
@@ -38,6 +38,7 @@ th::th (gh& h_, int const timelevels_, vector<int> const& reffacts_,
(time_interpolation_during_regridding_),
timelevels(timelevels_), reffacts(reffacts_)
{
+ assert (timelevels_ > 0);
assert (reffacts.size() >= 1);
assert (reffacts.front() == 1);
for (size_t n = 1; n < reffacts.size(); ++ n) {