How to Fix a Unity iOS Game Crashing on Launch

A Unity iOS game that crashes on launch but runs in the editor needs the device crash log to diagnose. The causes are usually configuration, not gameplay. Here is how to find yours.

How to fix it

1. Read the Xcode crash log

Connect the device and open the crash log in Xcode's Devices and Simulators window. It shows the exception type and a stack that names the cause — a missing symbol, a permission, a memory termination.

2. Check capabilities and permissions

iOS terminates apps that use a feature without the declared usage string or capability (camera, tracking, etc.). Add the required Info.plist entries and capabilities for everything the game touches at launch.

3. Confirm IL2CPP and memory settings

An IL2CPP stripping issue can crash at startup; preserve reflected types with link.xml. And a large startup allocation can be killed by the OS on older devices — reduce the initial memory footprint.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Unity error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.