Runtime Error Solver
Diagnose and resolve runtime errors instantly
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Why does it run fine on your machine and fall over in staging? The code compiled. The tests passed. Then a real request arrives, something is null that should not be, and the stack trace points at a line that looks innocent. The Runtime Error Solver reads the error and the code together and tells you what actually went wrong.
Runtime Error Solver works out which line is actually responsible when the trace points somewhere innocent. Paste the message and the code around it, and you get the cause, a corrected version and the guard that stops a repeat.
What is Runtime Error Solver?
The Runtime Error Solver is a debugging assistant for the failures that only appear once code is running: null references, type mismatches, division by zero, index out of range, connections that never open. Paste the code and the message together, and it works backwards from the failure. It reads text and writes text. Nothing executes, and it cannot see the rest of your project.
What Comes Back When You Hit Generate
The cause, not the symptom
Explain Root Cause is on by default, so the answer opens with why the value was wrong.
Code you can compare
Provide Fixed Code returns a patched version beside the original.
A way to stop the repeat
Suggest Prevention adds the guard, test or type change that stops a repeat.
A failing case to run
Switch Show Test to Reproduce on for a small test that fails before the fix and passes after it.
How Does Runtime Error Solver Work?
- Paste the error message and the code around it.
- Pick a model from the selector.
- Set Language, or leave it on Auto-Detect, and set Issue Type to Runtime Error.
- Generate, then read the explanation before the code.
Analysis Depth starts on Standard, and Deep earns its extra wait on anything intermittent. Thoroughness starts at 70 percent.
Paste enough context The last line of a stack trace says where the program stopped, not where it went wrong. Include the failing function and its caller.
A Checkout That Broke On A Missing Discount
A Python checkout function started failing for a few orders. The paste was the traceback plus the twenty lines around it, with Language set to Python, Issue Type set to Runtime Error and Output set to Fix + Explanation.
TypeError: unsupported operand type for +: NoneType and int
File "checkout.py", line 84, in apply_discount
total = subtotal + discount_amountThe reply came back with "Root cause: apply_discount assumes the lookup always returns a number ..." and traced it to a promo code that had expired. It suggested defaulting to zero at the lookup rather than guarding at the sum, which is the difference between hiding a bug and fixing it.
Fitting It Into A Debugging Session
Use it early, when you have the error but not the shape of the problem, or late, when the same twelve lines have stopped making sense. Read the explanation first and decide for yourself whether to take the code. Set Output to Root Cause when you still want to do the digging, and to Corrected Code when you already understand the failure and simply want it gone.
Judging The Fix Before You Merge It
The answer is a hypothesis written confidently. Check it the way you would check a colleague's pull request.
| Check | What you are looking for |
|---|---|
| The explanation matches the trace | The named line is the line in your file |
| The cause sits upstream | A guard at the crash site often hides the real bug |
| Behaviour has not quietly changed | An early return is not always what you wanted |
| You saw it fail first | A fix you never watched fail cannot be confirmed |
There is no sign up and no setup on EizTools. Every tool works straight from the page, each with its own options panel, and you choose the AI model per generation. When the problem turns out to be a plain syntax slip rather than a runtime failure, the Error Fixer is the quicker stop.
Frequently Asked Questions
Does Runtime Error Solver run my code?
No. Nothing executes. It reads the code and the error you paste, reasons about them, and writes an explanation back. You apply the fix and test it in your own environment.
What should I paste alongside the error?
The full message or stack trace, the function that failed, and its caller if you have it. Add what you expected to happen. Context is what separates a real diagnosis from a guess.
Does Issue Type matter when I already pasted the error?
It narrows the search. Set it to Runtime Error and the tool stops weighing syntax and memory explanations. Leave it on Auto-Detect when the symptom is vague and you are not sure which category the failure belongs to.
Can it help with a bug I cannot reproduce?
Set Analysis Depth to Deep and switch Show Test to Reproduce on. You get a candidate failing case to try. Treat it as a starting hypothesis rather than proof, and verify it yourself.
An error message is a symptom, and the interesting part is almost always upstream of it. Paste the failure with the code around it, read the reasoning before the patch, and keep the fix only if the explanation still holds up.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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