diff --git a/common/version/version.go b/common/version/version.go
index ce651093c..7a49b1aef 100644
--- a/common/version/version.go
+++ b/common/version/version.go
@@ -5,7 +5,7 @@ import (
 	"runtime/debug"
 )
 
-var tag = "v4.4.12"
+var tag = "v4.4.13"
 
 var commit = func() string {
 	if info, ok := debug.ReadBuildInfo(); ok {
diff --git a/coordinator/internal/logic/provertask/prover_task.go b/coordinator/internal/logic/provertask/prover_task.go
index 1b0989693..471036508 100644
--- a/coordinator/internal/logic/provertask/prover_task.go
+++ b/coordinator/internal/logic/provertask/prover_task.go
@@ -32,7 +32,9 @@ type ProverTask interface {
 func reverseMap(input map[string]string) map[string]string {
 	output := make(map[string]string, len(input))
 	for k, v := range input {
-		output[v] = k
+		if k != "" {
+			output[v] = k
+		}
 	}
 	return output
 }
diff --git a/coordinator/internal/logic/verifier/verifier.go b/coordinator/internal/logic/verifier/verifier.go
index 02e4c60d8..c9e13a2e6 100644
--- a/coordinator/internal/logic/verifier/verifier.go
+++ b/coordinator/internal/logic/verifier/verifier.go
@@ -166,7 +166,5 @@ func (v *Verifier) loadEmbedVK() error {
 
 	v.BatchVKMap["bernoulli"] = base64.StdEncoding.EncodeToString(batchVKBytes)
 	v.ChunkVKMap["bernoulli"] = base64.StdEncoding.EncodeToString(chunkVkBytes)
-	v.BatchVKMap[""] = base64.StdEncoding.EncodeToString(batchVKBytes)
-	v.ChunkVKMap[""] = base64.StdEncoding.EncodeToString(chunkVkBytes)
 	return nil
 }