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-rw-r--r--src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java b/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
index c95a62df3..f47677f6e 100644
--- a/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
+++ b/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
@@ -101,6 +101,9 @@ public class ScramSha1 extends SaslMechanism {
public String getResponse(final String challenge) throws AuthenticationException {
switch (state) {
case AUTH_TEXT_SENT:
+ if (challenge == null) {
+ throw new AuthenticationException("challenge can not be null");
+ }
serverFirstMessage = Base64.decode(challenge, Base64.DEFAULT);
final Tokenizer tokenizer = new Tokenizer(serverFirstMessage);
String nonce = "";