diff --git a/src/d_net.cpp b/src/d_net.cpp
index d9eca7a43..6e1d4436e 100644
--- a/src/d_net.cpp
+++ b/src/d_net.cpp
@@ -2110,7 +2110,7 @@ static int RemoveClass(const PClass *cls)
 				continue;
 			}
 			// [SP] Don't remove owned inventory objects.
-			if (static_cast<AInventory *>(actor)->Owner != NULL)
+			if (actor->IsKindOf(RUNTIME_CLASS(AInventory)) && static_cast<AInventory *>(actor)->Owner != NULL)
 			{
 				continue;
 			}