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-rw-r--r--cpp/023call_reply1
1 files changed, 1 insertions, 0 deletions
diff --git a/cpp/023call_reply b/cpp/023call_reply
index 476875ab..4c9fe34c 100644
--- a/cpp/023call_reply
+++ b/cpp/023call_reply
@@ -27,6 +27,7 @@ case REPLY: {
     callee_results.push_back(read_memory(instructions[pc].ingredients[i]));
   }
   rr.calls.pop();
+  assert(!rr.calls.empty());
   size_t& caller_pc = rr.calls.top().pc;
   instruction& caller_instruction = Recipe[rr.calls.top().running_recipe].steps[caller_pc];
   assert(caller_instruction.products.size() <= callee_results.size());