Ubuntu’s problem – 18.04

Since several days I have a problem, each time I want to use the computer. A pop-up window shows, saying Ubuntu have a problem and has to shut-down. When I see the reason of the problem, it’s due to enter image description here

I don’t know how to solve this problem. How can I eliminate baloo_file_extractor? Besides I have Ubuntu 18.04 and baloo belongs to KDE. Please, I need your urgent help because the computer freezes very often and I think is because of this archive. Thanks.