diff --git a/src/replay/index.ts b/src/replay/index.ts
index 7af8bf63..fc5dddd1 100644
--- a/src/replay/index.ts
+++ b/src/replay/index.ts
@@ -129,8 +129,6 @@ export class Replayer {
     events: Array<eventWithTime | string>,
     config?: Partial<playerConfig>,
   ) {
-    events.sort((a1, a2) => a1.timestamp - a2.timestamp);
-
     if (!config?.liveMode && events.length < 2) {
       throw new Error('Replayer need at least 2 events.');
     }
@@ -199,12 +197,14 @@ export class Replayer {
     const timer = new Timer([], config?.speed || defaultConfig.speed);
     this.service = createPlayerService(
       {
-        events: events.map((e) => {
-          if (config && config.unpackFn) {
-            return config.unpackFn(e as string);
-          }
-          return e as eventWithTime;
-        }),
+        events: events
+          .map((e) => {
+            if (config && config.unpackFn) {
+              return config.unpackFn(e as string);
+            }
+            return e as eventWithTime;
+          })
+          .sort((a1, a2) => a1.timestamp - a2.timestamp),
         timer,
         timeOffset: 0,
         baselineTime: 0,
diff --git a/src/replay/machine.ts b/src/replay/machine.ts
index d2e3313f..61dbb58b 100644
--- a/src/replay/machine.ts
+++ b/src/replay/machine.ts
@@ -243,7 +243,7 @@ export function createPlayerService(
               // fast track
               events.push(event);
             } else {
-              let insertion_index = -1;
+              let insertionIndex = -1;
               let start = 0;
               while (start <= end) {
                 let mid = Math.floor((start + end) / 2);
@@ -253,13 +253,12 @@ export function createPlayerService(
                   end = mid - 1;
                 }
               }
-              if (insertion_index === -1) {
-                insertion_index = start;
+              if (insertionIndex === -1) {
+                insertionIndex = start;
               }
-              events.splice(insertion_index, 0, event);
+              events.splice(insertionIndex, 0, event);
             }
 
-
             const isSync = event.timestamp < baselineTime;
             const castFn = getCastFn(event, isSync);
             if (isSync) {