Why does my Unreal game crash in the packaged build but not the editor?

Because a packaged Unreal build differs from the editor in cooking, optimization, platform, and behavior, so a bug latent in the editor (PIE) manifests in the packaged build. The Unreal editor (Play In Editor) and a packaged build differ: packaged builds cook content (assets processed for the target, so a cooking or reference issue can crash the package but not the editor), optimize and compile for the target platform, and run standalone (without editor conveniences and tolerances), so a game working in PIE can crash in the packaged build from these differences (a cooked-asset issue, a platform-specific problem, a bug exposed by the packaged build). Testing only in the editor (a common mistake) misses these packaged-build issues. To find them, capture crashes from the packaged game with stack traces. Bugnet captures crashes from packaged Unreal games in the field with full context, so the packaged-build crashes invisible in your editor are captured where they happen, with the stack traces and conditions to find the cause (cooking, platform, an exposed bug), so you can fix them and verify in a packaged build, debugging crashes your Unreal editor never shows because the package differs from PIE.

Should I use C++ or Blueprints for performance?

Use C++ (or optimize Blueprint use) for performance-critical hot paths like per-frame logic, since heavy Blueprint use in hot paths is slower than native code and can be a performance bottleneck. Blueprints are convenient and fine for most logic, but they have overhead compared to C++, so heavy Blueprint logic in performance-critical hot paths (especially per-frame Tick, tight loops, or frequently-called code) can become a bottleneck that hurts performance, a common Unreal mistake. The guidance is to use Blueprints for the convenience where performance is not critical, but move performance-critical hot-path logic to C++ (or optimize the Blueprint, reduce Tick usage, avoid expensive per-frame Blueprint operations) where it matters. Measure to find the actual bottlenecks rather than guessing. Bugnet captures performance data from real devices, so you can see whether your Unreal game has performance problems and on which devices, identify where performance is bad (directing your optimization, including moving hot-path Blueprint logic to C++), and verify per version that the optimization improved performance on real hardware, so you optimize based on measured bottlenecks rather than prematurely rewriting everything in C++.

Do I need crash reporting for an Unreal game?

Yes, crash reporting is essential for an Unreal game, because crashes happen across the devices, platforms, and packaged builds your players use (which you cannot all test), and most players who crash never report. A shipped Unreal game runs on hardware, platforms, and packaged builds you cannot fully test, surfacing device-specific, packaging-specific, and platform-specific crashes (including common null/invalid-access crashes), and most crashing players just quit rather than reporting, so without crash reporting you see almost none of your crashes. Crash reporting captures crashes automatically from real players with full context (stack trace, device, version), so you see the crashes your Unreal game actually produces, with the evidence to fix them and impact ranking to prioritize. Bugnet provides crash reporting that captures crashes automatically from your Unreal game's players with full context, signature grouping, impact ranking, and per-version tracking, so you can see, prioritize, fix, and verify the crashes across the devices and packaged builds your players use, rather than shipping your Unreal game blind to the crashes (null/invalid access, packaging-specific, device-specific) hurting it.

Common Unreal Engine Development Mistakes

Quick answer: The biggest Unreal mistakes are not testing packaged builds, Blueprint performance issues, missing null checks, and no crash reporting, fix these by testing packaged builds and capturing crashes.

Unreal Engine powers many games, and common mistakes cause crashes and performance issues. Here are the most common Unreal Engine development mistakes and how to avoid them.

Testing Only in the Editor, Not Packaged Builds

A common Unreal mistake is testing only in the editor (PIE) and not packaged builds, so packaging-specific issues, from cooking, optimization, and platform differences, ship unseen. The editor and a packaged build differ, so editor-only testing misses packaged-build bugs.

The fix is testing packaged builds on real devices, and capturing crashes from them. Bugnet captures crashes from packaged Unreal games in the field with full context, so the packaged-build issues your editor does not show become visible from real players, with the evidence to fix them.

Heavy Blueprint Use in Hot Paths

A second mistake is heavy Blueprint logic in performance-critical hot paths (per-frame Tick), which is slower than native code, hurting performance. Blueprints are convenient but can be a performance bottleneck when overused in hot paths.

The fix is moving performance-critical logic to C++ or optimizing Blueprint use in hot paths. Bugnet captures performance data from real devices, so you can see whether performance is bad (and where) and verify per version that optimizing hot-path logic improved it on real hardware.

Missing Null Checks

A third mistake is missing null/validity checks (accessing null pointers or invalid objects), a common Unreal crash, where a missing IsValid check or null pointer access crashes the game. Null/invalid access is a pervasive crash cause in Unreal.

The fix is checking validity before access, and catching the crashes from the field. Bugnet captures the null/invalid-access crashes from packaged games with stack traces, so you can see exactly where they happen and add the validity checks, then verify per version they stopped.

Avoid the big Unreal Engine mistakes: not testing packaged builds, Blueprint performance issues, missing null checks, and no crash reporting. Test packaged builds and capture crashes from the field.