Why does my game crash when loading a level?

Usually one of three things: a missing or broken asset the level references, a memory spike as the new level loads on top of the old one (an out-of-memory crash, especially on constrained devices), or stale references from the previous scene being used after it unloaded. The stack trace from a captured crash usually identifies which.

Why does my game only crash loading one specific level?

That points at that level's content rather than the loading process, most likely a bad, missing, or corrupt asset it references, or a broken reference specific to that level. A crash that happens loading various levels instead points at the loading process itself (a memory spike or teardown bug). The stack trace distinguishes them.

How do I fix an out-of-memory crash during level transitions?

Ensure the old level is fully unloaded and its memory freed before or as the new one loads, so both are not held in memory at once, and reduce peak memory usage on constrained platforms. If the crash clusters on low-memory devices in your crash data, the memory spike during the transition is the cause, and freeing the old scene's memory sooner is the fix.

How to Fix a Game That Crashes on Level Load

Quick answer: Crashes during level or scene loading typically stem from one of a few things: an asset that is missing, corrupt, or fails to load; a memory spike as the new level loads (especially if the old one was not fully freed); or stale references from the previous scene being used after it unloaded. The stack trace from a captured crash usually identifies which, pointing you at the specific load or teardown to fix.

A crash that happens when loading a level or transitioning between scenes is frustrating because it interrupts the player mid-progress, often repeatedly at the same spot. But level-load crashes are usually well-localized: the crash happens during a specific, bounded operation, loading a particular level, so the cause is almost always something about that load or the teardown of the previous scene.

Common Causes of Level-Load Crashes

Level loading does several risky things at once. The common causes: a missing or broken asset, the level references something that is not in the build, is corrupt, or fails to load, and the load crashes. A memory spike, loading a new level on top of an old one that was not fully unloaded can briefly need more memory than is available, causing an out-of-memory crash during the transition, especially on memory-constrained devices. And dangling references, code holding references to objects from the old scene that get destroyed on unload, then used during or after the transition, causing null/invalid access.

A crash that always happens loading the same specific level points at that level's content (a bad asset, a reference). A crash that happens loading various levels points at the loading process itself (memory, teardown) rather than any one level's data.

How to Diagnose It

Capture the crash and read the stack trace, it usually distinguishes the causes clearly: a trace in asset/deserialization code points at a bad asset; an out-of-memory crash points at the memory spike; a null/invalid reference in code that ran during the transition points at dangling references from the old scene. The device context matters too, if the level-load crash clusters on low-memory devices, it is the memory spike.

Bugnet captures the stack trace, device context (including memory), and build version with each crash and groups them by signature, so level-load crashes cluster and you can see whether they share a specific level, a memory profile, or a code path. Whether they concentrate on certain hardware tells you if it is a content bug (everyone loading that level) or a resource bug (only constrained devices).

How to Fix It

For a missing or broken asset, verify the asset is included and valid in the build (editor-versus-build asset issues are common) and handle a failed load gracefully rather than crashing. For the memory spike, ensure the old level is fully unloaded and its memory freed before or as the new one loads, consider loading transitions that do not hold both levels in memory at once, and reduce peak memory on constrained platforms. For dangling references, make sure code does not retain and use references to objects from a scene after it unloads, clear or rebind references on transition.

After fixing, verify the specific level (or the loading process generally) no longer crashes, and watch the field reports: a level-load crash cluster should vanish on the fixed build. Because these crashes often hit many players at the same progression point, fixing them removes a significant, repeated source of frustration and lost progress.

A level-load crash is well-localized to that load or the old scene's teardown. The trace tells you which, bad asset, memory spike, or dangling reference, so you can target it.