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-rw-r--r--Source/WarpXEvolve.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/WarpXEvolve.cpp b/Source/WarpXEvolve.cpp
index 98ff18983..a3905b2ce 100644
--- a/Source/WarpXEvolve.cpp
+++ b/Source/WarpXEvolve.cpp
@@ -345,7 +345,7 @@ WarpX::MoveWindow ()
int gid = mfi.index();
Box grid = ba[gid];
Box intersectBox = grid & particleBox;
- if (intersectBox.numPtsOK() == 0) continue;
+ if (intersectBox.isEmpty()) continue;
RealBox intersectRealBox { intersectBox, dx, geom[0].ProbLo() };
#if (BL_SPACEDIM == 3)