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IDProjectCategoryView StatusLast Update
15621Bug reportsSurvey participants (Tokens)public2019-11-26 15:11
Reportermos3465 Assigned Tocdorin  
Status assignedResolutionopen 
Summary15621: Re-accessing a submitted token-based survey will sometimes clear entries from random question groups

Referring to this thread in LS forum:

We use an old 3.5.0, but others have the same problem with 3.15.9.


  • we enabled "token-based response persistence"
  • we allowed "multiple responses or update responses with one token"

We get occasional reports from respondents and our quality control team, that random variables are cleared upon re-accessing formely submitted surveys.
In our case it's never the complete survey that is wiped, but from what I have seen so far it seems to be a complete question page in each instance.
Order of magnitude: maybe 4-5 % of re-accessed links.

I can rule out that it's the some kind of user's fault, as there were 2 instances where the questions that got cleared upon re-opening the link
1) were mandatory List (radio) question where the users can't "de-select" once an option is selected
2) is itself always shown (relevance=1) and was on a page with relevance=1 (so no messing with earlier questions that could have made the page / question irrelevant)

Steps To Reproduce

I have seen that it definitely happened (see above), but couldn't reproduce this myself, as it seems to happen randomly.

TagsNo tags attached.
Complete LimeSurvey version number (& build)3.5.0 (build 180309), also shown for 3.15.9
I will donate to the project if issue is resolvedNo
Database & DB-Versionmysqlnd 5.0.12-dev - 20150407
Server OS (if known)Apache/2.4.18 (Ubuntu)
Webserver software & version (if known)
PHP Version7.0.28-0ubuntu0.16.04.1


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Issue History

Date Modified Username Field Change
2019-11-26 14:39 mos3465 New Issue
2019-11-26 15:11 cdorin Assigned To => cdorin
2019-11-26 15:11 cdorin Status new => assigned