PHP fatal: Access attempt to the protected member of the EntityDrupalWrapper class

[RoSk0]

This line will issue a PHP fatal error when reached.
No sure about the correct fix so there is no solution to this from me.

[ndobromirov]

The issue is caused because the message type does not have the field that is set to be used for storing the rendered output for the view mode. The 2 checks in the code are validating that there is a configuration for it and the field is present in the system. Nothing enforces that the field is added to the message entity.

In this PR there is a fix for the issue mentioned here for the 7.x version of the module. (or it could be something else...)