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-rw-r--r--src/interpolate.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/interpolate.c b/src/interpolate.c
index bb5a286..fac3409 100644
--- a/src/interpolate.c
+++ b/src/interpolate.c
@@ -28,6 +28,7 @@ Rot180_CheckTensorTypes (CCTK_ARGUMENTS)
int ierr;
numvars = CCTK_NumVarsInGroupI(gi);
+ if (numvars == 0) continue;
assert (numvars>0);
firstvar = CCTK_FirstVarIndexI(gi);
assert (firstvar>=0);