Pending Order not placed due to invalid S/L or T/P when both were zero

[BigAl]

Can anyone explain this for me please

08:30:40 '5234474': pending order buy stop 1.00 GBPUSD at 1.7671 sl: 0.0000 tp: 0.0000

08:30:41 '5234474': order buy stop 1.00 GBPUSD opening at 1.7671 sl: 0.0000 tp: 0.0000 failed [Invalid S/L or T/P]

[antslag]

invalid price buy stop. "[Invalid S/L or T/P]" when invalid price - it's buf of metatrader 4.