When certain circumstances are triggered, any program can go rogue at any time. If Twitter is performing strangely or crashing on your smartphone for the first time, it's most likely a random malfunction that may be resolved by restarting the program or device. The first thing you should do is:

• Close or quit the Twitter app.
• Press and hold the Power button to do a soft reset or restart on your iPhone 7, then slide to power off the device fully. Press and hold the Power button for a few seconds until the device power cycles.