diff --git a/common/version/version.go b/common/version/version.go
index a06c232c17..a9b3af2c69 100644
--- a/common/version/version.go
+++ b/common/version/version.go
@@ -5,7 +5,7 @@ import (
 	"runtime/debug"
 )
 
-var tag = "v4.4.64"
+var tag = "v4.4.65"
 
 var commit = func() string {
 	if info, ok := debug.ReadBuildInfo(); ok {
diff --git a/rollup/internal/controller/watcher/bundle_proposer.go b/rollup/internal/controller/watcher/bundle_proposer.go
index 6b67347b25..480a867523 100644
--- a/rollup/internal/controller/watcher/bundle_proposer.go
+++ b/rollup/internal/controller/watcher/bundle_proposer.go
@@ -2,6 +2,7 @@ package watcher
 
 import (
 	"context"
+	"errors"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -146,6 +147,12 @@ func (p *BundleProposer) proposeBundle() error {
 	if err != nil {
 		return err
 	}
+
+	if firstChunk == nil {
+		log.Error("first chunk not found", "start chunk index", batches[0].StartChunkIndex, "start batch index", batches[0].Index, "firstUnbundledBatchIndex", firstUnbundledBatchIndex)
+		return errors.New("first chunk not found in proposeBundle")
+	}
+
 	hardforkName := forks.GetHardforkName(p.chainCfg, firstChunk.StartBlockNumber, firstChunk.StartBlockTime)
 	codecVersion := encoding.CodecVersion(batches[0].CodecVersion)
 	for i := 1; i < len(batches); i++ {