Looking at "master"'s code here you can see:

String value = tag.getValue()

And, two lines down, we check:

if (key.isEmpty() || value.isEmpty())

But if value is null, "isEmpty" will throw an unwanted "NullPointException". Instead, in this place, we should check value != null and then value.isEmpty().

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. append a tag with null value

Expected behavior:
Ignore the tag

Actual behavior:
Throws error

Specifications:

• Client Version: current master
• InfluxDB Version: 2.1
• JDK Version: 11
• Platform: Windows/MacOS