diff --git a/internal/proxy/meta_cache.go b/internal/proxy/meta_cache.go
index a89960f009cd1edbd8aadcf2d9453c05d680c28e..4b8d6924faecba396c7dcd6556612b7dc1b24a01 100644
--- a/internal/proxy/meta_cache.go
+++ b/internal/proxy/meta_cache.go
@@ -384,6 +384,8 @@ func (m *MetaCache) GetPartitions(ctx context.Context, collectionName string) (m
 	metrics.ProxyCacheStatsCounter.WithLabelValues(strconv.FormatInt(paramtable.GetNodeID(), 10), "GetPartitions", metrics.CacheHitLabel).Inc()
 
 	ret := make(map[string]typeutil.UniqueID)
+	m.mu.RLock()
+	defer m.mu.RUnlock()
 	partInfo := m.collInfo[collectionName].partInfo
 	for k, v := range partInfo {
 		ret[k] = v.partitionID