The problem was solved by correcting the sending of special characters from url ajax, also resolved a problem that occasions to use the euro symbol in the field Suggest on internet explorer.
I've not been able to reproduce this bug, however I could see into the code it's doing "SELECT FIELD_UID, FIELDA, FIELDB FROM YOURTABLE" then to solve this issue I have added some code now the code it's doing "SELECT FIELD_UID, FIELDA, FIELDB FROM YOURTABLE where FIELDA LIKE 'FIELDSEARCH%'"