ERRORSRC 0x1 on UART handler

Question

Hello, 
 On my custom board, I'm receiving chunks of UART data, without flow control, at 115200bps. Sometimes (its quite frequent now... sometimes after 10 chunks, sometimes after 100 chunks), im getting ERRORSRC 1 on APP_ERROR_HANDLER(p_event->data.error_communication); line. 
 My board doesn't include a 32kHz oscillator, and Im using NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION as my clock source (I don't care about current consumption). I'm also using SDK 8 with SoftDevice 8.0.0. 
 What would cause this? Any idea how to solve it? 
 edit 
Edited title so it makes more clear. Thanks @RK

RK · Accepted Answer

No you're not getting that error. That field in the event structure doesn't return an NRF_ERROR_* code (look in the documentation or just read the code), it returns the raw error from ERRORSRC in the UART. 
 If you then look at the nRF52 series documentation for ERRORSRC you'll see '1', which is the error code you're getting, is an overrun error, which, since you're trying to do no-flow-control at 115,200 is not very surprising. 
 You can probably run at that baud rate without flow control if the chip's not doing anything else, I'm going to guess you're trying it whilst using the softdevice and that's not going to work.

ERRORSRC 0x1 on UART handler

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