Recoverable fatal error: Object of class Message could not be converted to string in DatabaseStatementBase->execute() (line 2171 of /home/databasename/public_html/includes/database/database.inc).

I am getting this in both Firefox and Chrome. It comes up when I try to delete a node.

Recoverable fatal error: Object of class Message could not be converted to string in DatabaseStatementBase->execute() (line 2171 of /home/databasename/public_html/includes/database/database.inc).

I am running 7.39 and Message 7.x.1.10

Very irritating - because I have nodes I can't delete.