check needed only when recover with null is disabled

cpp/src/io/fst/logical_stack.cuh

@@ -514,7 +514,7 @@ void sparse_stack_op_to_top_of_stack(StackSymbolItT d_symbols,
   }
 
   // Check if the last element of d_kv_operations is 0. If not, then we have a problem.
-  if (num_symbols_in) {
+  if (num_symbols_in && !supports_reset_op) {
     StackOpT last_symbol = d_kv_ops_current.element(num_symbols_in - 1, stream);
     CUDF_EXPECTS(last_symbol.stack_level == 0, "The logical stack is not empty!");
   }