Quick answer: To handle uncaught exceptions in GameMaker, anticipate the usual cause — an error your code raised but nothing recovered from or recorded — and install a global handler that captures every uncaught exception with full context before the game exits. The discipline is to never swallow these errors silently: handle what you can recover from, fail loudly where you cannot, and capture every case with its stack trace, device, and build so the ones you could not anticipate still reach you.
Handling uncaught exceptions well in GameMaker is a balance between defending against the cause and accepting that you will not catch everything by hand. These errors usually come from an error your code raised but nothing recovered from or recorded, and the instinct to wrap them in a silent catch-and-continue is exactly the wrong move, because it hides the failure and often leaves the game in a worse state. This guide covers how to handle uncaught exceptions in GameMaker properly: install a global handler that captures every uncaught exception with full context before the game exits.
Handling uncaught exceptions at the source
In GameMaker, uncaught exceptions most often come from an error your code raised but nothing recovered from or recorded. The first line of defence is to anticipate that: install a global handler that captures every uncaught exception with full context before the game exits. That removes the cases you can foresee, which is a large share of them. The key discipline is to handle only what you can genuinely recover from — a catch block that suppresses the error and carries on is almost always a mistake.
Never swallow uncaught exceptions silently. Every suppressed error is a bug you have guaranteed you will never hear about, and it frequently leaves the game running in the broken state that caused it. A loud, captured failure is far more useful than a quiet corruption.
What good context actually looks like
The difference between a bug you fix in five minutes and one you chase for a week is almost always context. A bare error message tells you something went wrong; a useful report tells you where, on what, after what sequence of actions, in which build. Stack trace, device model, OS version, available memory, and the breadcrumb trail of recent events are the fields that turn guessing into reading.
When that context is captured automatically and consistently, reproduction stops being the bottleneck. You can often see the cause directly in the trace, and when you cannot, the breadcrumbs show you the exact path to walk to reproduce it yourself.
Turning a pile of crashes into a ranked worklist
Raw crash data is overwhelming if every occurrence is its own line. The trick is grouping: identical failures, fingerprinted by their stack trace, collapse into one issue with a count. Suddenly the question “what should I fix first?” answers itself, because the bug hitting the most players sits at the top with the biggest number next to it.
That ordering is what makes a small team effective. You are never going to fix everything, but you do not have to. Fixing the top few signatures usually removes the large majority of real-world failures, and prioritising by frequency means your limited hours always go to the bug that matters most right now.
Why the report you get is never the whole story
When a player does take the time to tell you something broke, the message is almost always thin: “it crashed,” maybe a screenshot, rarely a version number, and almost never the exact steps. You are left reconstructing the scene of an accident from a single blurry photo. The information you actually need to fix the bug — the stack trace, the device, the build, the state the game was in — is precisely what a human report leaves out.
That is why working from manual reports alone keeps you slow. Every ticket becomes a back-and-forth interrogation, and half the time the player has moved on before you get an answer. Automatic capture removes the interrogation entirely, because the context travels with the failure the instant it happens.
Capturing the uncaught exceptions you can't anticipate
Some uncaught exceptions in GameMaker depend on hardware, timing, or sequences you will never reproduce on your own machine. You cannot handle in advance what you cannot foresee, so the second half of the job is making sure those cases still reach you. Capture every one with its stack trace, the device and OS, the build, and the breadcrumb trail, automatically, whether or not the player says anything.
Grouped and ranked, the uncaught exceptions that survive your handling become a worklist rather than a surprise. You fix the highest-impact one first, tie failures to builds so a new one from a patch is obvious, and verify the fix by watching the signature disappear. Handling plus capture is what actually keeps uncaught exceptions from reaching your players.
This is where a tool like Bugnet earns its place. Its SDK captures every failure automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds identical failures into one grouped issue with an occurrence count, and ties each to the build it happened on. The result is that the abstract idea above stops being theory and becomes a ranked list you work down — the worst problem first, verified fixed when its signature disappears from the next release.
The crashes you never hear about are the ones costing you most. Visibility is what turns them into a list you can actually work down.