Make sure the attribute on the template you are using allows the attribute to be overwritten. (Select the attribute and check the properties). Otherwise even though you might think LD should overwrite it because you have something in it, it doesn't always do that. Of course if enough people report the issue with inbound email, it might eventually get fixed.
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A simple solution is to set a default Title on Process.
We were seeing the same errors being generated by emails with blank subjects, repeating everytime the service ran. I just set the Default value for the Title attribute on Process to "(Subject Not Provided)", problem is solved.
If an email Subject is included, it overrides the default... so, no-harm/no-foul.