(fake) polls after import from wbb

[magnaromagna]

After import from wbb to 3.5 (now upgraded to 3.6.2) I noticed that many threads are tagged with "poll" (with the relative icon). Before the import, original threads have no any poll.
Each thread have

View Poll Results:
0% Voters: 0.
This poll is closed

If I try to Edit the poll I receive

Invalid Forum specified. If you followed a valid link, please notify the administrator

How to fix this? I have to cancel all "fake" polls.
Thanks

[Jerry]

Were the fake polls in the 3.5 before the upgrade as well ?

[magnaromagna]

yes, they were present before the upgrade, but I did not see theese threads (not all have fake post)

[magnaromagna]

I found the problem: in mysql, each thread have

pollid = 149

How can I run a query like

if pollid = 149 set to 0

Thanks

[Jerry]

With this SQL :

UPDATE thread SET pollid=0 WHERE pollid=149;