Undefined index: #node in submitted_by_process_node()

Viewing a node has produced the following consecutive errors:

Undefined index: #node in submitted_by_process_node() (line 205 of /sites/all/modules/submitted_by/submitted_by.module

Trying to get property of non-object in submitted_by_process_node() (line 210 of /sites/all/modules/submitted_by/submitted_by.module

Trying to get property of non-object in submitted_by_do_replace() (line 149 of /sites/all/modules/submitted_by/submitted_by.module

I believe this was caused alongside the Print module, so I'm attaching a patch that does a simple check in order to prevent any errors.