diff --git a/src/main/java/eu/siacs/conversations/crypto/sasl/ScramMechanism.java b/src/main/java/eu/siacs/conversations/crypto/sasl/ScramMechanism.java
index e5708e504dedd8a46c4f2f9f1f7dd51e1d1421d8..b3c36cda6f8890e7bcf276d728952d4ffcd271eb 100644
--- a/src/main/java/eu/siacs/conversations/crypto/sasl/ScramMechanism.java
+++ b/src/main/java/eu/siacs/conversations/crypto/sasl/ScramMechanism.java
@@ -151,7 +151,7 @@ abstract class ScramMechanism extends SaslMechanism {
                 int iterationCount = -1;
                 String salt = "";
                 for (final String token : tokenizer) {
-                    if (token.charAt(1) == '=') {
+                    if (token.length() > 1 && token.charAt(1) == '=') {
                         switch (token.charAt(0)) {
                             case 'i':
                                 try {