diff --git a/c_bindings/pocketpy_c.cpp b/c_bindings/pocketpy_c.cpp
index 5fbe2ac3..4927198c 100644
--- a/c_bindings/pocketpy_c.cpp
+++ b/c_bindings/pocketpy_c.cpp
@@ -625,5 +625,6 @@ void* pkpy_get_id(pkpy_vm* vm_handle, int index) {
     CVM* vm = (CVM*) vm_handle;
     index = lua_to_cstack_index(index, vm->c_data->size());
     PyObject* o = vm->c_data->begin()[index];
+    if(is_tagged(o)) return nullptr;
     return (void*) o;
 }
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