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-rw-r--r--Carpet/Carpet/src/Restrict.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/Carpet/Carpet/src/Restrict.cc b/Carpet/Carpet/src/Restrict.cc
index f8d7397bf..ada404cd0 100644
--- a/Carpet/Carpet/src/Restrict.cc
+++ b/Carpet/Carpet/src/Restrict.cc
@@ -107,6 +107,7 @@ namespace Carpet {
if (reflevel < reflevels-1) {
for (int group=0; group<CCTK_NumGroups(); ++group) {
if (CCTK_GroupTypeI(group) == CCTK_GF
+ && CCTK_NumVarsInGroupI(group) > 0
&& CCTK_QueryGroupStorageI(cgh, group)) {
SyncGVGroup(cgh, group);
}