False name of table. Chaned and tested ok.

Patch for resolving is this:

diff --git a/administrator/components/com_fields/Table/FieldTable.php b/administrator/components/com_fields/Table/FieldTable.php
index c7bc876..0efd355 100644
--- a/administrator/components/com_fields/Table/FieldTable.php
+++ b/administrator/components/com_fields/Table/FieldTable.php
@@ -112,7 +112,7 @@
$this->name = str_replace(',', '-', $this->name);

	// Verify that the name is unique

•   $table = new Field($this->_db);
  

•   $table = new FieldTable($this->_db);
  
    if ($table->load(array('name' => $this->name)) && ($table->id != $this->id || $this->id == 0))
    {
  

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/18711

closed as having Pull Request #18742