problem with the update and log file

[chrono-kun]

I have foolslide 0.8.14 and I have problems to upgrade to the latest version 0.8.19. I've tried both through web pages and via ssh. By web page:

From the last week i have a problem with log file, the line appears: Severity: Warning --> Creating default object from empty value /home/hastarea/www/slide/application/models/comic.php 80
and generates a 2GB file.
thanks so much.