Quick answer: Attach a condition to the breakpoint so it only fires when the bad value appears, use hit counts to skip to a known iteration, and add a data breakpoint to catch the moment a field changes.
Stepping through a loop ten thousand times to find the one bad entry is hopeless. A conditional breakpoint lets the debugger do the watching: it runs at full speed and only pauses when the exact condition you specified becomes true.
How to set it up
1. Add a condition expression
Right-click the breakpoint and add a condition like enemy == null && index > 500. Execution runs normally and only halts when that expression is true, landing you precisely on the failing iteration.
2. Use a hit count when you know the iteration
If a log told you it fails on iteration 4711, set the breakpoint to break only on hit count 4711. The debugger counts for you instead of you pressing continue thousands of times.
3. Set a data breakpoint on the field
When a value is being corrupted and you do not know where, set a data (watchpoint) breakpoint on the field. The debugger stops at the exact line that writes the bad value, even if it is in code you would never have suspected.
4. Log-and-continue if pausing changes timing
If halting alters behavior, make the breakpoint print the state and continue instead. You still get the condition-filtered observation without freezing the run.
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 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.
Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.