1 files changed, 1 insertions, 0 deletions
diff --git a/cpp/019array b/cpp/019array
index 51265826..d6ae0eae 100644
--- a/cpp/019array
+++ b/cpp/019array
@@ -41,6 +41,7 @@ size_t size_of(reagent r) {
     return result;
   }
   if (t.is_array) {
+    assert(!r.name.empty());
     int base = to_int(r.name);
     if (Memory[base] == 0) return 0;
     ostringstream out;