Hi there!
This issue just blew up on me. Here’s a “hack” to solve it! I’m assuming you’re not a developer, but you’re at least a bit savvy.
If you choose to make this change, it will probably be overwritten in the next app update, but hopefully this problem will be solved in the next AUR release.
First off, backup the file “/opt/stremio/server.js” wherever you feel like it. Changes will be made to this file.
Open up “/opt/stremio/server.js” with your text editor of choice, and with root (admin) privileges. You will need those to save your changes.
Search for the line that reads
“details.family = details.family.toLowerCase();”
As the error says, it is line 135945. Replace it for
“details.family = details.family.toString().toLowerCase();”
Notice that the difference is just the text “.toString()”. Save your changes.
If you edit the file correctly, Stremio should open without errors.
If not, restore your backup and wait for the upstream fix.
Good luck!