From a160358d5d32e9049cf59683f3063b7c1b35135c Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Sat, 24 Aug 2019 12:22:38 +0200
Subject: [PATCH] OMEMO: Allow prekey ID 0

---
 .../jivesoftware/smackx/omemo/element/OmemoBundleElement.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/element/OmemoBundleElement.java b/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/element/OmemoBundleElement.java
index efe872ec3..b9c27060d 100644
--- a/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/element/OmemoBundleElement.java
+++ b/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/element/OmemoBundleElement.java
@@ -60,8 +60,8 @@ public abstract class OmemoBundleElement implements ExtensionElement {
      * @param preKeysB64 HashMap of base64 encoded preKeys
      */
     public OmemoBundleElement(int signedPreKeyId, String signedPreKeyB64, String signedPreKeySigB64, String identityKeyB64, HashMap<Integer, String> preKeysB64) {
-        if (signedPreKeyId <= 0) {
-            throw new IllegalArgumentException("signedPreKeyId MUST be greater than 0.");
+        if (signedPreKeyId < 0) {
+            throw new IllegalArgumentException("signedPreKeyId MUST be greater than or equal to 0.");
         }
         this.signedPreKeyId = signedPreKeyId;
         this.signedPreKeyB64 = StringUtils.requireNotNullNorEmpty(signedPreKeyB64, "signedPreKeyB64 MUST NOT be null nor empty.");