diff --git a/muted-tests.yml b/muted-tests.yml
index 2cb96c3c42d4e..16834cc782469 100644
--- a/muted-tests.yml
+++ b/muted-tests.yml
@@ -390,9 +390,6 @@ tests:
 - class: org.elasticsearch.index.engine.ThreadPoolMergeSchedulerTests
   method: testSchedulerCloseWaitsForRunningMerge
   issue: https://github.com/elastic/elasticsearch/issues/125236
-- class: org.elasticsearch.reservedstate.service.ReservedClusterStateServiceTests
-  method: testProcessMultipleChunks
-  issue: https://github.com/elastic/elasticsearch/issues/125305
 
 # Examples:
 #
diff --git a/server/src/main/java/org/elasticsearch/reservedstate/service/ReservedClusterStateService.java b/server/src/main/java/org/elasticsearch/reservedstate/service/ReservedClusterStateService.java
index d33a61e1a3bfd..d455a978dcf70 100644
--- a/server/src/main/java/org/elasticsearch/reservedstate/service/ReservedClusterStateService.java
+++ b/server/src/main/java/org/elasticsearch/reservedstate/service/ReservedClusterStateService.java
@@ -423,7 +423,7 @@ public void process(
             ErrorState errorState = new ErrorState(
                 projectId,
                 namespace,
-                reservedStateChunks.getFirst().metadata().version(),
+                reservedStateChunks.isEmpty() ? EMPTY_VERSION : reservedStateChunks.getFirst().metadata().version(),
                 versionCheck,
                 e,
                 ReservedStateErrorMetadata.ErrorKind.PARSING
diff --git a/server/src/test/java/org/elasticsearch/reservedstate/service/ReservedClusterStateServiceTests.java b/server/src/test/java/org/elasticsearch/reservedstate/service/ReservedClusterStateServiceTests.java
index 1cb2190850ed9..ac860d1b21508 100644
--- a/server/src/test/java/org/elasticsearch/reservedstate/service/ReservedClusterStateServiceTests.java
+++ b/server/src/test/java/org/elasticsearch/reservedstate/service/ReservedClusterStateServiceTests.java
@@ -404,7 +404,7 @@ public void testProcessMultipleChunks() throws Exception {
         AtomicReference<Exception> exceptionRef = new AtomicReference<>();
         List<ReservedStateChunk> chunks = new ArrayList<>();
 
-        String[] randomStateKeys = generateRandomStringArray(randomIntBetween(5, 10), randomIntBetween(10, 15), false);
+        String[] randomStateKeys = generateRandomStringArray(randomIntBetween(5, 10), randomIntBetween(10, 15), false, false);
 
         List<ReservedClusterStateHandler<ProjectMetadata, ?>> projectHandlers = new ArrayList<>();
         for (var key : randomStateKeys) {