diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index 5a28bba9a..2decc24a3 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -4292,7 +4292,8 @@ killed:
 						}
 
 						r = get_wavelength_bin(&parts[i].ctype);
-						if (r == -1) {
+						if (r == -1 || !(parts[i].ctype&0x3FFFFFFF))
+						{
 							kill_part(i);
 							continue;
 						}