When saving a node (or translation) the module checks the machine_name to be unique.
This check tries to load a node with the submitted machine name and the current language.
That translation does not yet exist (you are about to create it) and it results in an error.
Before trying to load the translation, check if it exists. Otherwise return NULL.
Create a dedicated method for checking machine names without actually loading nodes.
Review patch.
None.
New method 'isMachineNameUsed' will be available.
Fixed
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The MR was already merged by @webfordreams and added to the 2.1.4 , so the issue is already fixed.
Automatically closed - issue fixed for 2 weeks with no activity.