i click on application launcher and switch to a cathegory like system then i scroll up and down with my mousewheel and most likely this will force plasmashell into a total crash. happens about 80% i am doing this and the longer i scroll the more likely it crashes. 
mouse is: logitech m318e usb corded
crashlog here: http://goo.gl/B7Ajkj

Reproducible: Sometimes

Steps to Reproduce:
1.click on application launcher 
2.go to an app cathegory like system
3.scroll up and down with your mousewheel
Actual Results:  
plasmashell crashed completely

crash log: http://goo.gl/B7Ajkj

Expected Results:  
scrolling up and down and remain stable even if i do this for 10 minutes. 

mouse is logitech m318e corded
crash log: http://goo.gl/B7Ajkj