JNI DETECTED ERROR IN APPLICATION: use of invalid jobject 0x20 about lazysodium-android HOT 6 CLOSED

// Initialise somewhere at the start of program execution
SodiumAndroid sodiumAndroid = new SodiumAndroid();
LazySodiumAndroid lazySodium = new LazySodiumAndroid(sodiumAndroid);

// ....

// Get signing keypair
String message = "sign this please";
KeyPair keyPair = lazySodium.cryptoSignKeypair();
SodiumAndroid sodium = lazySodium.getSodium();

// Initialise byte arrays
byte[] messageBytes = lazySodium.bytes(message);
byte[] skBytes = keyPair.getSecretKey();
byte[] signatureBytes = new byte[Sign.BYTES];

// IMPORTANT: Put null as the second parameter
sodium.crypto_sign_detached(signatureBytes, null, messageBytes, messageBytes.length, skBytes);

// If you really want the length...
// int sigByteLength = signatureBytes.length

String signature = LazySodium.toHex(signatureBytes);
boolean result = lazySodium.cryptoSignVerifyDetached(signature, message, keyPair.getPublicKeyString()); // Returns true

// Initialise somewhere at the start of program execution
SodiumAndroid sodiumAndroid = new SodiumAndroid();
LazySodiumAndroid lazySodium = new LazySodiumAndroid(sodiumAndroid);

// ....

// Get signing keypair
String message = "sign this please";
KeyPair keyPair = lazySodium.cryptoSignKeypair();
String signature = lazySodium.cryptoSignDetached(message, keyPair.getSecretKeyString());
boolean result = lazySodium.cryptoSignVerifyDetached(signature, message, keyPair.getPublicKeyString()); // Returns true