There's been quite a lot of instances of this issue occurring. To help resolve the issue as best as possible, please collect the dump file while the game is still running and provide it here. To generate a dump file:
- Find "League of Legends (32 bit)" under the Background processes section (not Apps section) on the Processes tab
- Right click it and select create dump file. This will create the dump and tell you where it is stored (you can copy+paste that file path)
- Find the file (will be a DMP File type) and reduce its size by Right click > Send To > Compressed (zipped) folder
- Upload this compressed file to a google drive and share here. Alternatively, you can open a support ticket and attach the file to the ticket.
Thank you!