initialize buffer MultiFabs if gather from main grid

1 files changed, 3 insertions, 2 deletions

diff --git a/Source/WarpX.cpp b/Source/WarpX.cpp
index d2ccc71ef..6c6bb8107 100644
--- a/Source/WarpX.cpp
+++ b/Source/WarpX.cpp
@@ -916,12 +916,13 @@ WarpX::AllocLevelMFs (int lev, const BoxArray& ba, const DistributionMapping& dm
     //
     // Copy of the coarse aux
     //
-    if (lev > 0 && (n_field_gather_buffer > 0 || n_current_deposition_buffer > 0))
+    if (lev > 0 && (n_field_gather_buffer > 0 || n_current_deposition_buffer > 0 ||
+                    mypc->nSpeciesGatherFromMainGrid() > 0))
     {
         BoxArray cba = ba;
         cba.coarsen(refRatio(lev-1));
 
-        if (n_field_gather_buffer > 0) {
+        if (n_field_gather_buffer > 0 || mypc->nSpeciesGatherFromMainGrid() > 0) {
             // Create the MultiFabs for B
             Bfield_cax[lev][0].reset( new MultiFab(amrex::convert(cba,Bx_nodal_flag),dm,ncomps,ngE));
             Bfield_cax[lev][1].reset( new MultiFab(amrex::convert(cba,By_nodal_flag),dm,ncomps,ngE));