Error while cumulative tags creation. Error- Expression left operand is null

Ignition
2

You can’t have a tag act on itself. Use a gateway timer script instead.

Example:

runningTag = '[default]test/isRunning'
hrsTag = '[default]test/RunTime'

isRunning, hours = [tag.value for tag in system.tag.readBlocking([runningTag, hrsTag])]

if isRunning:
	hours += 1
	system.tag.writeBlocking([hrsTag], hours)
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