diff --git a/src/tests/api-example1.c b/src/tests/api-example1.c
index 7de0db2..f45d54b 100644
--- a/src/tests/api-example1.c
+++ b/src/tests/api-example1.c
@@ -2,12 +2,12 @@
 #include <stdio.h>
 
 int main() {
-	const char mySeed[] = "RandomX example seed";
+	const char myKey[] = "RandomX example key";
 	const char myInput[] = "RandomX example input";
 	char hash[RANDOMX_HASH_SIZE];
 
 	randomx_cache *myCache = randomx_alloc_cache(RANDOMX_FLAG_DEFAULT);
-	randomx_init_cache(myCache, mySeed, sizeof mySeed);
+	randomx_init_cache(myCache, &myKey, sizeof myKey);
 	randomx_vm *myMachine = randomx_create_vm(RANDOMX_FLAG_DEFAULT, myCache, NULL);
 
 	randomx_calculate_hash(myMachine, &myInput, sizeof myInput, hash);
diff --git a/src/tests/api-example2.cpp b/src/tests/api-example2.cpp
index 216160a..5b3757e 100644
--- a/src/tests/api-example2.cpp
+++ b/src/tests/api-example2.cpp
@@ -4,7 +4,7 @@
 #include <thread>
 
 int main() {
-	const char mySeed[] = "RandomX example seed";
+	const char myKey[] = "RandomX example key";
 	const char myInput[] = "RandomX example input";
 	char hash[RANDOMX_HASH_SIZE];
 
@@ -13,21 +13,26 @@ int main() {
 		std::cout << "Cache allocation failed" << std::endl;
 		return 1;
 	}
-	randomx_init_cache(myCache, mySeed, sizeof mySeed);
+	randomx_init_cache(myCache, myKey, sizeof myKey);
 
 	randomx_dataset *myDataset = randomx_alloc_dataset(RANDOMX_FLAG_LARGE_PAGES);
 	if (myDataset == nullptr) {
 		std::cout << "Dataset allocation failed" << std::endl;
 		return 1;
 	}
+
 	auto datasetItemCount = randomx_dataset_item_count();
 	std::thread t1(&randomx_init_dataset, myDataset, myCache, 0, datasetItemCount / 2);
-	std::thread t2(&randomx_init_dataset, myDataset, myCache, datasetItemCount / 2, datasetItemCount / 2);
+	std::thread t2(&randomx_init_dataset, myDataset, myCache, datasetItemCount / 2, datasetItemCount - datasetItemCount / 2);
 	t1.join();
 	t2.join();
 	randomx_release_cache(myCache);
 
 	randomx_vm *myMachine = randomx_create_vm((randomx_flags)(RANDOMX_FLAG_FULL_MEM | RANDOMX_FLAG_JIT | RANDOMX_FLAG_HARD_AES | RANDOMX_FLAG_LARGE_PAGES), nullptr, myDataset);
+	if (myMachine == nullptr) {
+		std::cout << "Failed to create a virtual machine" << std::endl;
+		return 1;
+	}
 
 	randomx_calculate_hash(myMachine, &myInput, sizeof myInput, hash);