assert the particles are positive to check for overflow (#1142)

1 files changed, 3 insertions, 0 deletions

diff --git a/Source/Particles/PhysicalParticleContainer.cpp b/Source/Particles/PhysicalParticleContainer.cpp
index 112180a2b..94766d48a 100644
--- a/Source/Particles/PhysicalParticleContainer.cpp
+++ b/Source/Particles/PhysicalParticleContainer.cpp
@@ -685,6 +685,9 @@ PhysicalParticleContainer::AddPlasma (int lev, RealBox part_realbox)
             pid = ParticleType::NextID();
             ParticleType::NextID(pid+max_new_particles);
         }
+        WarpXUtilMsg::AlwaysAssert(static_cast<int>(pid + max_new_particles) > 0,
+                                   "ERROR: overflow on particle id numbers");
+
         const int cpuid = ParallelDescriptor::MyProc();
 
         auto& particle_tile = GetParticles(lev)[std::make_pair(grid_id,tile_id)];