Xojo 2025 R2.1 crashing randomly while launching app in the Simulator

[Jason_Tait]

I’m running Xojo 2025 R2.1 on macOS Tahoe 26.0.1 and Xcode 26.0.1. I can run and build my app just fine but every second or third time I run it in the iOS Simulator, Xojo will crash before my app launches and I lose any unsaved work. I then need to open up Xojo and open my app and run it again (and then it runs, until the next time Xojo crashes) so I’m obviously now saving every time before running but the time it takes to relaunch Xojo and reload my app is slowing me down.

Is anybody else seeing this? Does this first part of the error report provide any clues?

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Translated Report (Full Report Below)

Process: Xojo [20203]
Path: /Applications/Xojo 2025 Release 2.1/Xojo.app/Contents/MacOS/Xojo
Identifier: com.xojo.xojo
Version: 25.2.1.65621 (25.2.1.3.65621)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.xojo.xojo [36682]
User ID: 501

Date/Time: 2025-10-24 08:47:37.5318 +1100
Launch Time: 2025-10-24 08:43:44.3812 +1100
Hardware Model: MacBookPro18,4
OS Version: macOS 26.0.1 (25A362)
Release Type: User

Crash Reporter Key: DA32C104-339A-7031-3894-A94E4958EF2C
Incident Identifier: E397C8B0-8058-4593-BF73-7815C4EF18EA

Sleep/Wake UUID: ADD987F7-35C6-40DF-92E0-9676B493D18B

Time Awake Since Boot: 610000 seconds
Time Since Wake: 75227 seconds

System Integrity Protection: enabled

Triggered by Thread: 0

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x000073adcf1283e0
Exception Codes: 0x0000000000000001, 0x000073adcf1283e0

VM Region Info: 0x73adcf1283e0 is not in any region.
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
—>
UNUSED SPACE AT END

Thread 0 Crashed:
0 libobjc.A.dylib 0x184bac104 objc_release + 16
1 libobjc.A.dylib 0x184bb3c74 AutoreleasePoolPage::releaseUntil(objc_object**) + 204
2 libobjc.A.dylib 0x184bb0140 objc_autoreleasePoolPop + 244
3 CoreFoundation 0x185061774 _CFAutoreleasePoolPop + 32
4 Foundation 0x18688e0c4 -[NSAutoreleasePool drain] + 136
5 AppKit 0x189475750 -[NSApplication run] + 416
6 XojoFramework 0x10fd09950 RuntimeRun + 60
7 Xojo 0x100be00f4 REALbasic._RuntimeRun + 16
8 Xojo 0x10d7f4948 _Main + 356
9 Xojo 0x10d7cecd0 main + 20
10 dyld 0x184c31d54 start + 7184

[Jeremie_L]

This might already be fixed for 2025R3 but just in case please open an issue with the full crash log.

[Arnaud_N]

@Jason_Tait

every second or third time I run it in the iOS Simulator, Xojo will crash before my app launches

FWIW, it was already discussed recently: 2025r2.1 Tahoe 26.0.1 (25A362) Xojo Crash
Not sure it’s the same issue as yours, but may worth a check.

@Jason_Tait

so I’m obviously now saving every time before running

It’s good practice to always do that, even without crash.
Especially since the IDE can’t recover unsaved projects as of now; this drives me crazy…

[Beatrix_Willius]

@Arnaud_N

It’s good practice to always do that, even without crash.

That is what buildscripts are there for.

[Jason_Tait]

@Arnaud_N

FWIW, it was already discussed recently: 2025r2.1 Tahoe 26.0.1 (25A362) Xojo Crash
Not sure it’s the same issue as yours, but may worth a check.

Thanks. Unfortunately it’s not the same as mine – I’m not swapping Simulator devices.

@Arnaud_N

It’s good practice to always do that, even without crash.

I always save regularly and haven’t had issues in the past with Xojo crashing on run. Sometimes though I want to try something and might just want to roll back by not saving so I don’t always save. I’ve now setup a build script to save.