diff --git a/work20220401/neoString/CString.cpp b/work20220401/neoString/CString.cpp
index fe4327e..af97eda 100644
--- a/work20220401/neoString/CString.cpp
+++ b/work20220401/neoString/CString.cpp
@@ -149,5 +149,5 @@ std::istream &operator>>(std::istream &inputStream, const CString &source) {
 }
 
 char CString::operator[](const int i) const {
-    return data[i];
+    return (i < MAX_LENGTH) ? data[i] : '\0';
 }
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