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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 = Executor.addRepetitiveTask(function() { console.log("Should run only once, no exception should appear afterwards"); },100); Executor.addTimedTask(function() { Executor.stopRepetitiveTask(r); },100); });