www.LoadFromCacheOrDonwload Crash on Android!!!

I'm using Unity 5.3.5f1 Personal Edition.

I made sort of a patch system by using AssetbundleManager(https://www.assetstore.unity3d.com/kr/#!/content/45836).

And everything seems to work well.

However, some android phone ( in this case, i tested it on LG GPad 4.0) says an error on a certain assetbundle.

These are my steps.

1. Download ManifestFile which contains assetbundes' info.

2. Call www.LoadFromCashOrDownload.

And here's my code. ( I have about 50 asset bundles.)

  for (int nIndex = 0; nIndex < m_lDownloadList.Count; nIndex++)
 {
     Debug.Log("###############1" + GetCDNBasicURL() + m_lDownloadList[nIndex] );
 
     while (Caching.ready == false)
         yield return null;
     Debug.Log("###############2" + GetCDNBasicURL() + m_lDownloadList[nIndex] );
     WWW www = WWW.LoadFromCacheOrDownload(GetCDNBasicURL() + m_lDownloadList[nIndex], m_cManifest.GetAssetBundleHash(m_lDownloadList[nIndex]));            
             
     while (www.isDone == false)
     {
         yield return null;
     }
     Debug.Log("###############3" + GetCDNBasicURL() + m_lDownloadList[nIndex] );
     if (!string.IsNullOrEmpty(www.error))
     {                
         Debug.Log("PcAssetBundleManager] IEDownloadManifest() - Download manifest has an error : " + www.error.ToString());
         www.Dispose();
         yield break;
     }            
     Debug.Log("###############4" + GetCDNBasicURL() + m_lDownloadList[nIndex] );
     AssetBundle bundle = www.assetBundle;
     if ( bundle != null )
     {
         Debug.Log("###############5" + GetCDNBasicURL() + m_lDownloadList[nIndex] );
         bundle.Unload( false );
     }
             
     Debug.Log("###############6" + GetCDNBasicURL() + m_lDownloadList[nIndex] );
 
     www.Dispose();
 }

When I download about 15 assetbundles, then it crashed right after WWW.LoadFromCacheOrDownload function. I can say it because I put the logs.

And here's crash log.

 I Unity   : (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37): com.phiru.speedtapper
 I Unity   : : com.phiru.speedtapper
 D libc    : getaddrinfo called from pid =19407: com.phiru.speedtapper
 I Vold    : [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action:0: /system/bin/vold
 I Vold    : [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action:0: /system/bin/vold
 I Vold    : [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action:0: /system/bin/vold
 F libc    : invalid address or address of corrupt block 0x66e6f020 passed to try_realloc_chunk: com.phiru.speedtapper
 F libc    : Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 19435 (AsyncReadManage): com.phiru.speedtapper
 I ThermalEngine: Sensor:pa_therm1:47000 mC: /system/bin/thermal-engine
 I ThermalEngine: Sensor:pa_therm1:47000 mC: /system/bin/thermal-engine
 I ThermalEngine: TM Id 'MONITOR_BATTERY' Sensor 'pa_therm1' - alarm raised 1 at 47.0 degC: /system/bin/thermal-engine
 I ThermalEngine: ACTION: BATTERY - Setting battery charging mitigation to 1100: /system/bin/thermal-engine
 I ThermalEngine: Mitigation:Battery:1100: /system/bin/thermal-engine

Did I do something wrong?

Please help me out :(