<p><b>@aabadie</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/12161#discussion_r320207853">boards/nucleo-l031k6/include/periph_conf.h</a>:</p>
<pre style='color:#555'>>  };
 
 #define UART_0_ISR          (isr_usart2)
+#define UART_1_ISR          (isr_usart1)
</pre>
<p>The ISR function is not correct, it should be <code>isr_lpuart1</code>. This is probably why you get a crash.</p>

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