-INSERT INTO systempreferences (variable,value,options,explanation,type) VALUES ('ReplytoDefault', '', NULL, 'The default email address to be set as replyto.', 'Free');
-INSERT INTO systempreferences (variable,value,options,explanation,type) VALUES ('ReturnpathDefault', '', NULL, 'The default email address to be set as return-path', 'Free');
+INSERT IGNORE INTO systempreferences (variable,value,options,explanation,type) VALUES ('ReplytoDefault', '', NULL, 'The default email address to be set as replyto.', 'Free');
+INSERT IGNORE INTO systempreferences (variable,value,options,explanation,type) VALUES ('ReturnpathDefault', '', NULL, 'The default email address to be set as return-path', 'Free');