diff --git a/simple-store.go b/simple-store.go
index 8fcd258..1e98292 100644
--- a/simple-store.go
+++ b/simple-store.go
@@ -24,6 +24,11 @@ func NewSimpleStore() *SimpleStore {
 	return ctx
 }
 
+func (ss *SimpleStore) Init() {
+	ss.varStore = make(map[string]any)
+	ss.funcStore = make(map[string]ExprFunc)
+}
+
 func filterRefName(name string) bool  { return name[0] != '@' }
 //func filterPrivName(name string) bool { return name[0] != '_' }