Fix for periodic calculations with GPUs

src/hamiltonian/hamiltonian.F90

@@ -1016,6 +1016,14 @@ contains
       end if
       apply = .false.
     end if
+    
+    if(hamiltonian_base_projector_self_overlap(this%hm_base) .and. accel_is_enabled()) then
+      if(.not. warning_shown) then
+        call messages_write('Cannot use CUDA or OpenCL as some pseudopotentials overlap with themselves.')
+        call messages_warning()
+      end if
+      apply = .false.
+    end if
 
     warning_shown = .true.