Array of leds without limiting resistor?
but there is no limiting resistor in the upper line of leds. Is it ok?


No, it's not okay. Your upper line of LEDs will most likely burn up.


  If no, how I can modify this circuit?


Do as the other LED lines, add a resistor. 

Assuming that a white LED has a forward voltage of 2.8 V, then 4 of them will give you a forward voltage of 11.2 V, I'll assume you want 133 mA through your upper LED line. Because that is what you got through your second line of LEDs.

Then the resistance of the resistor that you will add on your upper line of LEDs will be \$\frac{12-11.2}{0.133}\approx6\text{ Ω}\$. You can probably get away with a 5 Ω resistor, though I have absolutely no idea because I don't have a datasheet in front of me. 

If I were you, then I would use a 10 Ω resistor because it's safer, if the LEDs has a forward voltage of 2.5 instead of 2.8, then with a 6 Ω resistor you will get 333 mA, more than twice. With a 10 Ω resistor you will get 200 mA, not as good but also not as bad.