Upon placing down a hopper (either one that's crafted or from separating it from a minecart), if anything is thrown into a hopper, the game then freezes and crashes (you can access the hopper's user interface and manually place things in there just fine). No issues with throwing anything into a 'minecart with hopper' though.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-18157.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Feedback – 📖 Game Wiki