diff --git a/src/kvstore/LogEncoder.cpp b/src/kvstore/LogEncoder.cpp
index 94b2c098d8f..3ef552baeda 100644
--- a/src/kvstore/LogEncoder.cpp
+++ b/src/kvstore/LogEncoder.cpp
@@ -176,7 +176,7 @@ std::string encodeHost(LogType type, const HostAddr& host) {
     return encoded;
 }
 
-HostAddr decodeHost(LogType type, folly::StringPiece encoded) {
+HostAddr decodeHost(LogType type, const folly::StringPiece& encoded) {
     HostAddr addr;
     CHECK_EQ(sizeof(int64_t) + 1 + sizeof(HostAddr), encoded.size());
     CHECK(encoded[sizeof(int64_t)] == type);
diff --git a/src/kvstore/LogEncoder.h b/src/kvstore/LogEncoder.h
index 475d0d21315..68e14e4c26a 100644
--- a/src/kvstore/LogEncoder.h
+++ b/src/kvstore/LogEncoder.h
@@ -42,7 +42,7 @@ std::vector<folly::StringPiece> decodeMultiValues(folly::StringPiece encoded);
 
 
 std::string encodeHost(LogType type, const HostAddr& learner);
-HostAddr decodeHost(LogType type, folly::StringPiece encoded);
+HostAddr decodeHost(LogType type, const folly::StringPiece& encoded);
 
 }  // namespace kvstore
 }  // namespace nebula
diff --git a/src/kvstore/raftex/RaftPart.cpp b/src/kvstore/raftex/RaftPart.cpp
index ca42ce4dff5..84ed8f6f532 100644
--- a/src/kvstore/raftex/RaftPart.cpp
+++ b/src/kvstore/raftex/RaftPart.cpp
@@ -469,7 +469,11 @@ void RaftPart::removePeer(const HostAddr& peer) {
     if (it == hosts_.end()) {
         LOG(INFO) << idStr_ << "The peer " << peer << " not exist!";
     } else {
-        CHECK(!(*it)->isLearner()) << idStr_ << "Peer " << peer << " should not be learner!";
+        if ((*it)->isLearner()) {
+            LOG(INFO) << idStr_ << "The peer is learner, remove it directly!";
+            hosts_.erase(it);
+            return;
+        }
         hosts_.erase(it);
         updateQuorum();
         LOG(INFO) << idStr_ << "Remove peer " << peer;