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just in case you're interested, on a page including the Lightstreamer library, you can reproduce the issue using this code:

require(["Executor"],function(Executor) {
var r =...

good news,

by chance I reproduced the error you're facing. I can't be sure the cause is the same but I hope so, even if in my case I got a stack trace.
I'm going to fix the bug tomorrow.

Just...

I checked the various calls to the method, but I'm still at a loss, I don't seem to be able to justify the error.

Can you please open the console on your application and run:
...

The line number is not relevant because it simply points to the place where the exception is thrown, but that's not where the problem lies as the null->NaN value is coming in as a parameter to that...

Which browser are you using?
Can you see the stack trace of the error?

The extra info Dario mentioned is not yet printed by the official builds, I'll have to send you a preview of the next...

Hi,

How did it happen?
Can you easily reproduce the issue?
Is "6.01" the version of the library? If so, any chance to use a newer version?