Wordpres debug.log PHP Notice: is_singular was called

If I were to hazard a guess, I would say you recently started using a theme or plugin or that one of those was recently updated. The error indicates that things are happening in the wrong order. This is not critical but somewhere some expected feature is probably not happening quite the way it was intended.

Your first step is to identify what is new (installed or updated) try switching them out one at a time and see for which one the errors stop when it is not in use. that one is your culprit.

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