when an error occurred , the inprogress downloads lost while they still available if re-download I can't resume lost downloads

[muath-ye]

Checklist

• I am able to reproduce the bug with the latest version given here: CLICK THIS LINK.
• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected version

0.27.0

Steps to reproduce the bug

start download
close the app for a while
stop internet for a while
start internet
come back to resume download
the in progress downloads are lost

Expected behavior

I should be able to resume downloads

Actual behavior

the not completed downloads are lost and when go to the video to download it , it till me that it is exist and I can't resume the download only overwrite not complete downloaded

Screenshots/Screen recordings

No response

Logs

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java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Thread.isAlive()' on a null object reference
at us.shandian.giga.get.DownloadMission.joinForThreads(DownloadMission.java:814)
at us.shandian.giga.get.DownloadMission.pauseThreads(DownloadMission.java:518)
at us.shandian.giga.get.DownloadMission.notifyError(DownloadMission.java:360)
at us.shandian.giga.get.DownloadMission.notifyError(DownloadMission.java:308)
at us.shandian.giga.get.DownloadRunnable.run(DownloadRunnable.java:145)

Affected Android/Custom ROM version

No response

Affected device model

No response

Additional information

No response