diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 89a8b1d..9f60196 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -7,6 +7,7 @@ add_library(
             src/page_rank.cpp
             src/inverted_index.cpp
             src/preprocessing/stemmer.cpp
+            src/exceptions/invalid_pointer_exception.cpp
 )
 
 target_include_directories(search_engine PUBLIC include)
diff --git a/lib/include/exceptions/invalid_pointer_exception.h b/lib/include/exceptions/invalid_pointer_exception.h
new file mode 100644
index 0000000..f7513a1
--- /dev/null
+++ b/lib/include/exceptions/invalid_pointer_exception.h
@@ -0,0 +1,16 @@
+#ifndef INVALID_POINTER_H
+#define INVALID_POINTER_H
+
+#include <exception>
+#include <string>
+
+namespace exceptions {
+class invalid_pointer_exception : public std::exception {
+   public:
+    invalid_pointer_exception();
+
+    const char* what() const noexcept override;
+};
+}  // namespace exceptions
+
+#endif
\ No newline at end of file
diff --git a/lib/include/preprocessing/stemmer.h b/lib/include/preprocessing/stemmer.h
index 9626bdf..23d82d3 100644
--- a/lib/include/preprocessing/stemmer.h
+++ b/lib/include/preprocessing/stemmer.h
@@ -11,6 +11,8 @@
 #include <unordered_map>
 #include <vector>
 
+#include "exceptions/invalid_pointer_exception.h"
+
 namespace stemmer {
 
 /**
diff --git a/lib/src/exceptions/invalid_pointer_exception.cpp b/lib/src/exceptions/invalid_pointer_exception.cpp
new file mode 100644
index 0000000..48ad4a5
--- /dev/null
+++ b/lib/src/exceptions/invalid_pointer_exception.cpp
@@ -0,0 +1,13 @@
+#include "exceptions/invalid_pointer_exception.h"
+
+namespace exceptions {
+
+// Definição do construtor com mensagem padrão
+invalid_pointer_exception::invalid_pointer_exception() {}
+
+// Definição do método what(), retornando a mensagem padrão
+const char* invalid_pointer_exception::what() const noexcept {
+    return "Invalid pointer exception occurred.";
+}
+
+}  // namespace exceptions
diff --git a/lib/src/preprocessing/stemmer.cpp b/lib/src/preprocessing/stemmer.cpp
index c4b6e80..b1c884d 100644
--- a/lib/src/preprocessing/stemmer.cpp
+++ b/lib/src/preprocessing/stemmer.cpp
@@ -199,14 +199,18 @@ std::string RSPL::removeAccents(const std::string& input) {
 }
 
 void RSPL::shrinkString(std::string* input) {
-    if (!input)
-        return;  // Verifica se o ponteiro é válido
-
-    icu::UnicodeString ustr(input->c_str(), "UTF-8");
-    ustr.toLower();
-    std::string result;
-    ustr.toUTF8String(result);
-    *input = result;
+    try {
+        if (!input)
+            throw exceptions::invalid_pointer_exception();
+
+        icu::UnicodeString ustr(input->c_str(), "UTF-8");
+        ustr.toLower();
+        std::string result;
+        ustr.toUTF8String(result);
+        *input = result;
+    } catch (const std::exception& e) {
+        std::cerr << e.what() << '\n';
+    }
 }
 
 bool RSPL::applyRules(std::string& word, const std::vector<StepRule>& rules) {