Unhandled .NET Exception (Event ID 1026) crashing UiPath.Executor.exe during "Get Asset" - AssetCacheManager.CacheAssetToFile

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1

Hi everyone,

I am encountering an intermittent issue where UiPath.Executor.exe crashes completely during the execution of a process. Based on my investigation, this seems to occur when the bot is trying to execute a Get Asset activity.

Instead of throwing a catchable UiPath exception, the process terminates abruptly with a standard Windows “UiPath Executor has stopped working” dialog. When I checked the Windows Event Viewer, I found an Application Error (Event ID 1000) and a .NET Runtime Error (Event ID 1026).

Environment:

  • UiPath Studio / Executor Version: 2025.10.7 (on the bot runner machine)

Here is the stack trace from the Event Viewer:

Application: UiPath.Executor.exe
CoreCLR Version: 8.0.1525.16413
.NET Version: 8.0.15
Description: The process was terminated due to an unhandled exception.
Exception Info: System.ArgumentNullException: Value cannot be null. (Parameter ‘source’)
at System.Linq.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
at System.Linq.Enumerable.Where[TSource](IEnumerable1 source, Func2 predicate)
at UiPath.OrchestratorClient.Utilities.AssetCacheManager.CacheAssetToFile()
at UiPath.OrchestratorClient.Utilities.AssetCacheManager.<>c.<.ctor>b__14_0(Object sender, EventArgs e)

Context & What I’ve tried:

  • The target Asset does exist and contains a valid value in Orchestrator. It is not actually null.
  • The bot runs perfectly fine most of the time; this crash happens randomly.
  • I have already tried clearing the local UiPath cache, but the issue eventually returns.
  • Note: I am aware that a highly similar issue occurred in older versions (e.g., UiPath.System.Activities 2022.10.3), where downgrading was the suggested workaround. However, I am looking for a long-term solution or troubleshooting steps without having to downgrade my current packages or Studio version.

My Questions:

  1. Is it possible that this is a regression bug specifically in the 2025.10.7 version affecting AssetCacheManager.CacheAssetToFile()?
  2. Could this be related to a micro-drop in the network connection between the bot machine and Orchestrator precisely during the caching phase? If so, how can I properly investigate and verify if it’s a network issue versus a local environment issue (e.g., Antivirus locking the cache file)?
  3. Are there any specific diagnostic logs or configurations I should check to pinpoint the exact root cause?

Any guidance on how to deep-dive into this would be greatly appreciated. Thank you!

Screenshot 2026-03-27 083921 corp
Screenshot 2026-03-27 083921 corp1282×466 42.8 KB

2

Hello @Sarin_Wanaerloh_UTL,

Can you please try UiPath diagnostic tool: Studio - About The Diagnostic Tool

Thanks,
Karthik

3

Hi @Sarin_Wanaerloh_UTL

This might be a regression pattern in newer builds when AssetCacheManager hits a null source during cache write. It is usually triggered by a brief network drop or a locked cache file. Check Windows Event Viewer, UiPath Robot logs (Execution and OrchestratorClient logs), and antivirus exclusions for the Robot cache folder. If the issue persists, raise a UiPath support ticket with logs because this version likely has an intermittent Asset caching bug.

If helpful, mark as solution. Happy automation with UiPath

4

Hi @chinthakayala_karthik, I checked the Event Viewer and found Event ID 1026 (ArgumentNullException at CacheAssetToFile). If I run the Diagnostic Tool, what exactly should I be looking for in the results?

5

Wrap the get Asset with a retry scope like:

grafik
grafik552×659 42.3 KB

And modify it to your needs

This pattern was also often used in the past to react on some network delays and to stabilize the asset value retrieval

6

Thanks! I’ll try adding the antivirus exclusions as you suggested and see if it works.

7

Thanks @ppr I usually use a Retry Scope for network delays too. But in this case, the ArgumentNullException instantly crashes the entire UiPath.Executor.exe process. If the whole application shuts down abruptly, would a Retry Scope even be able to catch it and run again?

8

just try it, as mentioned the usage stabilized it in the past in our many productive running projects

9

Hi @Sarin_Wanaerloh_UTL , would it be possible to share with us a couple of things:

  • event viewer logs
  • diagnostics tool logs
  • version of the system package where you are encountering it

You can send them as a message to myself or on this thread if possible.

11

@Raluca_Laic I apologize, but it seems I don’t have the permission to send a Private Message directly to you (the Message button is missing on my end).

Could you please initiate a Private Message with me first? Once you message me, I will reply and attach the Diagnostics tool .zip file and Event Viewer logs immediately. Thank you.

12

Thanks to @Raluca_Laic for the solution.

The issue is caused by a known bug in older UiPath.System.Activities versions (<22.10.5) related to asset cache cleanup. Here is a quick breakdown of the issue and how to fix it:

  • The Cause: When a process using Get Asset / Get Credential finishes, the cleanup routine may try to save cache data even when nothing was cached, throwing an unhandled exception.
  • The Behavior: This occurs during executor cleanup rather than workflow execution. This is why it can appear randomly, even while other processes are running.
  • Why Re-running Works: The issue is a transient state, not persistent data corruption, so a simple re-run usually bypasses the error.
  • The Solution: Updating all processes to System.Activities 22.10.5+ (preferably 23.4.x or later) will permanently resolve the issue.