diff --git a/src/commons/string.c b/src/commons/string.c
index fcab1d60..84add702 100644
--- a/src/commons/string.c
+++ b/src/commons/string.c
@@ -28,7 +28,6 @@ static void _string_upper_element(char* ch);
 void _string_append_with_format_list(const char* format, char** original, va_list arguments);
 char** _string_split(char* text, char* separator, bool(*is_last_token)(int));
 static void _string_array_push(char*** array, char* text, int size);
-static char* _string_array_replace(char** array, int pos, char* text);
 
 char *string_repeat(char character, int count) {
 	char *text = calloc(count + 1, 1);
@@ -246,11 +245,14 @@ void string_array_push(char*** array, char* text) {
 }
 
 char* string_array_replace(char** array, int pos, char* text) {
-	return string_array_size(array) > pos && pos >= 0 ? _string_array_replace(array, pos, text) : NULL;
+	char* old_text = array[pos];
+	array[pos] = text;
+
+	return old_text;
 }
 
 char* string_array_pop(char** array) {
-	return string_array_size(array) > 0 ? _string_array_replace(array, string_array_size(array) - 1, NULL) : NULL;
+	return string_array_replace(array, string_array_size(array) - 1, NULL);
 }
 
 /** PRIVATE FUNCTIONS **/
@@ -313,11 +315,4 @@ static void _string_array_push(char*** array, char* text, int size) {
 	*array = realloc(*array, sizeof(char*) * (size + 2));
 	(*array)[size] = text;
 	(*array)[size + 1] = NULL;
-}
-
-static char* _string_array_replace(char** array, int pos, char* text) {
-	char* old_text = array[pos];
-	array[pos] = text;
-
-	return old_text;
 }
\ No newline at end of file
diff --git a/tests/unit-tests/test_string.c b/tests/unit-tests/test_string.c
index fbaa02c5..aa3d012c 100644
--- a/tests/unit-tests/test_string.c
+++ b/tests/unit-tests/test_string.c
@@ -567,15 +567,6 @@ context (test_string) {
                 string_iterate_lines(names, _assert_names);
             } end
 
-            it ("not to remove elements in an empty array") {
-                for(int i = 0; i < 10; i++) {
-                    string_array_pop(names);
-                }
-
-                should_int(string_array_size(names)) be equal to (0);
-                should_bool(string_array_is_empty(names)) be truthy;
-            } end
-
             it("replace an element") {
                 char* name = string_array_replace(names, 2, "Damian");
 
@@ -590,23 +581,6 @@ context (test_string) {
                 }
                 string_iterate_lines(names, _assert_names);
             } end
-
-            it("not to replace an element outside the array") {
-                char* name = string_array_replace(names, 4, "Damian");
-
-                should_ptr(name) be null;
-                should_int(string_array_size(names)) be equal to (4);
-                should_ptr(names[4]) be null;
-
-                char* expected[] = {"Gaston", "Matias", "Sebastian", "Daniela"};
-                int i = 0;
-                void _assert_names(char* name) {
-                    should_ptr(name) not be null;
-                    should_string(name) be equal to (expected[i]);
-                    i++;
-                }
-                string_iterate_lines(names, _assert_names);
-            } end
         } end
     } end
 }