<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11187#discussion_r270620660">cpu/esp_common/esp-now/esp_now_netdev.c</a>:</p>
<pre style='color:#555'>> @@ -633,7 +633,7 @@ static int _send(netdev_t *netdev, const iolist_t *iolist)
     uint8_t* _esp_now_dst = NULL;
 
     for (uint8_t i = 0; i < ESP_NOW_ADDR_LEN; i++) {
-        if (((uint8_t*)iolist->iol_base)[i] != 0xff) {
+        if (iolist->iol_base != NULL && ((uint8_t*)iolist->iol_base)[i] != 0xff) {
</pre>
<blockquote>
<p>Ok, even though the compiler seems to be happy and doesn't warn.</p>
</blockquote>
<p>It's not about the compiler but about <a href="https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions#indentation-and-braces">readability / style</a> ;-).</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/RIOT-OS/RIOT/pull/11187#discussion_r270620660">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/AEn7YJFKeEi0CeaeppcCRA3WZoo3IMmGks5vbzx7gaJpZM4b0o0K">mute the thread</a>.<img src="https://github.com/notifications/beacon/AEn7YM-QwJRpLae7JIob3WQofHUxW99Rks5vbzx7gaJpZM4b0o0K.gif" height="1" width="1" alt="" /></p>
<script type="application/json" data-scope="inboxmarkup">{"api_version":"1.0","publisher":{"api_key":"05dde50f1d1a384dd78767c55493e4bb","name":"GitHub"},"entity":{"external_key":"github/RIOT-OS/RIOT","title":"RIOT-OS/RIOT","subtitle":"GitHub repository","main_image_url":"https://github.githubassets.com/images/email/message_cards/header.png","avatar_image_url":"https://github.githubassets.com/images/email/message_cards/avatar.png","action":{"name":"Open in GitHub","url":"https://github.com/RIOT-OS/RIOT"}},"updates":{"snippets":[{"icon":"PERSON","message":"@miri64 commented on #11187"}],"action":{"name":"View Pull Request","url":"https://github.com/RIOT-OS/RIOT/pull/11187#discussion_r270620660"}}}</script>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/RIOT-OS/RIOT/pull/11187#discussion_r270620660",
"url": "https://github.com/RIOT-OS/RIOT/pull/11187#discussion_r270620660",
"name": "View Pull Request"
},
"description": "View this Pull Request on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>