Do not query redundant `do_back_transformed_particles` (#3183)

* Do not query redundant do_back_transformed_particles

* Only set m_do_back_transformed_particles to true if write_species is true

1 files changed, 1 insertions, 3 deletions

diff --git a/Source/Diagnostics/BTDiagnostics.cpp b/Source/Diagnostics/BTDiagnostics.cpp
index dd82bcf0e..c519cd248 100644
--- a/Source/Diagnostics/BTDiagnostics.cpp
+++ b/Source/Diagnostics/BTDiagnostics.cpp
@@ -106,7 +106,7 @@ void BTDiagnostics::DerivedInitData ()
     if (m_output_species_names.size() == 0 and write_species == 1)
         m_output_species_names = mpc.GetSpeciesNames();
 
-    if (m_output_species_names.size() > 0) {
+    if (m_output_species_names.size() > 0 and write_species == 1) {
         m_do_back_transformed_particles = true;
     } else {
         m_do_back_transformed_particles = false;
@@ -158,8 +158,6 @@ BTDiagnostics::ReadParameters ()
     m_file_prefix = "diags/" + m_diag_name;
     pp_diag_name.query("file_prefix", m_file_prefix);
     pp_diag_name.query("do_back_transformed_fields", m_do_back_transformed_fields);
-    pp_diag_name.query("do_back_transformed_particles", m_do_back_transformed_particles);
-    AMREX_ALWAYS_ASSERT(m_do_back_transformed_fields or m_do_back_transformed_particles);
     WARPX_ALWAYS_ASSERT_WITH_MESSAGE(m_do_back_transformed_fields, " fields must be turned on for the new back-transformed diagnostics");
     if (m_do_back_transformed_fields == false) m_varnames.clear();