Error when update or add "Operations to do by collector"

Using my Dolibarr
1

When I try to add or edit “Operations to do by collector” I’ve always this error:
Cannot add or update a child row: a foreign key constraint fails (udlah5r1_dolibarr.llx_emailcollector_emailcollectoraction, CONSTRAINT fk_emailcollectoraction_fk_emailcollector FOREIGN KEY (fk_emailcollector) REFERENCES `llx_emailcollector_emailcoll)

2
  1. which dolibarr version do you run?
  2. what is shown in your php log from the webserver?
  3. what is shown in the dolbiarr.log file in the documents folder? (requires the right module to be enabled in dolibarr setup)