diff --git a/src/utils.cpp b/src/utils.cpp
index 5e6ba4c..1ee73cf 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -106,6 +106,8 @@ std::any DeQuate(std::any val, VariableContainer &Variables) {
 
 int ConverToSameArithType(std::any &a, std::any &b,
                           bool allow_string_operation) {
+  if (std::any_cast<NoneType>(&a)) a = (bool)false;
+  if (std::any_cast<NoneType>(&b)) b = (bool)false;
   ZYM::int2048 *ptr_a_int2048 = std::any_cast<ZYM::int2048>(&a);
   ZYM::int2048 *ptr_b_int2048 = std::any_cast<ZYM::int2048>(&b);
   double *ptr_a_float = std::any_cast<double>(&a);