diff --git a/packages/griffith-mp4/src/mp4/mp4Probe.js b/packages/griffith-mp4/src/mp4/mp4Probe.js
index e3905008..ea526770 100644
--- a/packages/griffith-mp4/src/mp4/mp4Probe.js
+++ b/packages/griffith-mp4/src/mp4/mp4Probe.js
@@ -65,9 +65,13 @@ export default class MP4Probe {
 
     const {videoSamples, audioSamples} = this.getSamples()
     const stcoBox = findBox(this.mp4BoxTree, 'videoStco')
+
+    let videoSamplesStart = 0
+    if (videoSamples.length > 0) {
+      videoSamplesStart = videoSamples[videoSamples.length - 1].start
+    }
     const isLastFragmentPosition =
-      videoSamples[videoSamples.length - 1].start +
-        videoSamples[videoSamples.length - 1].bufferStart ===
+      videoSamplesStart + videoSamples[videoSamples.length - 1].bufferStart ===
       stcoBox.samples[stcoBox.samples.length - 1].chunkOffset
 
     return getFragmentPosition(
diff --git a/packages/griffith-mp4/src/mp4/utils/getFragmentPosition.js b/packages/griffith-mp4/src/mp4/utils/getFragmentPosition.js
index 6c7af64e..c816a42a 100644
--- a/packages/griffith-mp4/src/mp4/utils/getFragmentPosition.js
+++ b/packages/griffith-mp4/src/mp4/utils/getFragmentPosition.js
@@ -5,7 +5,11 @@ export default function getFragmentPosition(
   isLastFragmentPosition
 ) {
   const videoSamplesEnd = videoSamples[videoSamples.length - 1].end
-  const videoSamplesStart = videoSamples[0].start
+  let videoSamplesStart = 0
+
+  if (videoSamples.length > 0) {
+    videoSamplesStart = videoSamples[0].start
+  }
 
   // maybe the last GOP dont have audio track
   // 最后一个 GOP 序列可能没有音频轨
diff --git a/packages/griffith-mp4/src/mse/controller.js b/packages/griffith-mp4/src/mse/controller.js
index 9862cbc6..12382681 100644
--- a/packages/griffith-mp4/src/mse/controller.js
+++ b/packages/griffith-mp4/src/mse/controller.js
@@ -68,7 +68,7 @@ export default class MSE {
         }
       } catch (error) {
         // see https://developers.google.com/web/updates/2017/10/quotaexceedederror
-        if (error.name === 'QuotaExceededError') {
+        if (error.code === 22) {
           this.handleQuotaExceededError(buffer, type)
         } else {
           throw error
@@ -313,7 +313,13 @@ export default class MSE {
       const track = this.sourceBuffers[key]
 
       const currentTime = this.video.currentTime
-      this.removeBuffer(track.buffered.start(0) + 10, currentTime - 10, key)
+
+      let removeStart = 0
+
+      if (track.buffered.length > 0) {
+        removeStart = track.buffered.start(0) + 10
+      }
+      this.removeBuffer(removeStart, currentTime - 10, key)
     }
 
     // re-append(maybe should lower the playback resolution)
diff --git a/packages/griffith-mp4/src/player.js b/packages/griffith-mp4/src/player.js
index 55b088eb..c446dead 100644
--- a/packages/griffith-mp4/src/player.js
+++ b/packages/griffith-mp4/src/player.js
@@ -87,7 +87,11 @@ export default class Player extends Component {
   // 如果当前时间为 0，safari 浏览器需要把 currentTime 设置成 buffered.start(0) 右边一点点的位置
   // 否则 MSE 无法正常播放，会卡在 loading 状态。
   handleSafariBug = () => {
-    const start = this.video.buffered.start(0)
+    let start = 0
+
+    if (this.video.buffered.length > 0) {
+      start = this.video.buffered.start(0)
+    }
     this.video.currentTime = start + 0.1
   }