I'm not sure if it's related to Panels or if it's because there aren't any other node links, but this line:
$node->content['links']['node']['#links'] = array_merge($node->content['links']['node']['#links'], $links);
is looking for a sub array "node" which doesn't exist. The #links array is in
I've included a snapshot of the node object to review. I can supply a patch, but I don't know if this issue is specifically with Panels, and if so, how to detect Panels to fix it.
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