# Unpredictable results when trying to pre-populate forms
**URL:** https://forum.mautic.org/t/unpredictable-results-when-trying-to-pre-populate-forms/4171
**Category:** Product Support
**Created:** [June 28, 2016, 8:04am UTC](https://forum.mautic.org/t/unpredictable-results-when-trying-to-pre-populate-forms/4171 "2016-06-28T08:04:07Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@dirk\_s](https://forum.mautic.org/u/dirk_s)
#### Post date: [June 28, 2016, 8:04am UTC](https://forum.mautic.org/t/unpredictable-results-when-trying-to-pre-populate-forms/4171/1 "2016-06-28T08:04:07Z")
I worked along [this documentation](https://mautic.org/docs/en/forms/manage_forms.html). I ran several tests, but wasn’t able to get it working constantly.
Often the URL generated with “ct=” part, but missing “email=” part or the exact opposite way. Both won’t work. There might be some problem with Mautic editor, as it saved {pagelink=10}&email=%7Bleadfield=email|true%7D instead of {pagelink=10}&email={Bleadfield=email|true}. Manually correcting it in the source code editor didn’t fix it.
Rarely I had a correct link, but there seems to be a second problem. Emails with a “+” sign in their id part are not correctly filled into the form. The “+” sign gets replaced by space. Not good.
Has anyone succeeded with correctly pre-populating fields repeatedly?
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### Author:  [@dirk\_s](https://forum.mautic.org/u/dirk_s)
#### Post date: [June 28, 2016, 8:04am UTC](https://forum.mautic.org/t/unpredictable-results-when-trying-to-pre-populate-forms/4171/2 "2016-06-28T08:04:07Z")
I worked along [this documentation](https://mautic.org/docs/en/forms/manage_forms.html). I ran several tests, but wasn’t able to get it working constantly.
Often the URL generated with “ct=” part, but missing “email=” part or the exact opposite way. Both won’t work. There might be some problem with Mautic editor, as it saved {pagelink=10}&email=%7Bleadfield=email|true%7D instead of {pagelink=10}&email={Bleadfield=email|true}. Manually correcting it in the source code editor didn’t fix it.
Rarely I had a correct link, but there seems to be a second problem. Emails with a “+” sign in their id part are not correctly filled into the form. The “+” sign gets replaced by space. Not good.
Has anyone succeeded with correctly pre-populating fields repeatedly?