Blue Square below Trigger Node

Hi all, am trying to debug a problem with my flow.

Quick description of it: I am reading OPCUA values from a PLC server and am trying to write it into my influxdb. I have set a condition with my trigger node such that if Variable X exceeds a certain value, it'll then start writing data. However, this wasn't the case. It worked in the beginning, but as I add more data, it stopped. debugging make me realize the trigger node isn't being triggered anymore, during running of flow, this blue square appears at the left bottom of the node as seen in image.
maybe i'm not too specific with my googling skills, perhaps someone encountered such problem before? Thanks

I apologize. The problem was sending nothing every cycle with my trigger node. Apparently that won't trigger the following node.

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