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Peirates hybridus
Well as I am seeing it correctly they are not really identical....stridulus has sometimes 1 pair of spots on wing more and they are round while this: http://www.biolib.cz/en/taxonimage/id948... looks exactly like mine...but still I don't know whether is that enough to determine it.
Uups... There is another "identical" one: Peirates stridulus.
http://www.galerie-insecte.org/galerie/p...
I will change the suggestion in Peirates, since I can't really separate them. Maybe you can check the range and location for Croatia.