Hello,
New user here - love the app and interface. I recently started using TrainerDay with my Schwinn IC4, but it crashes (12 X in last 30 min ride). It just quits, I reopen over and over. I have uninstalled, rebooted iPad and then reinstalled but the problem persists. I am using an iPad Pro 11-inch M4 with iOS 18.3.1.
Strange. No one else has issues like this that I have heard of. I will have my developers look at the logs to see if they can find the problem and let you know in the next couple days. I know we have other IC4 users so that should not be the problem.
Some things to try
You could try registering for a new account and just see if it happens on the free version to make sure it’s not something strange with your data.
For now you could use a phone assuming it is issue with M4
We should be able to get this fixed fairly soon if we find the problem. If you purchased from Apple you might want to ask for a refund. It’s cheaper from us and I can’t do much to extend your contract for example if you bought from them. If you bought from us we can figure something out.
Same, crashing in ERG every time there is changes in power
Edit:
I have only seen the problem when there is an interval change in ERG.
No crash in ERG without interval change.
No crash in Slope.
Hmm, so that would make it seem like it is related to your IC4. Let me have my developers investigate our crash logs tomorrow and see if they see it.
I’m another user 
I use a Tacx Neo Bike Plus and iPad Air M1
Oops sorry. Oh very strange ok then two M series users crashing.
I will test my m-series and see if I can replicate it.
Alex,
I was unable to try the suggestions until this afternoon.
russfg is my paid profile
I created russfg01 - as free profile
Maybe related - i noticed when looking at my russfg profile, the
User account info, in the iPad app it says I weight 504.9 lbs (LOL), when I type my actually weight in the field - the app will pop a ridiculous value instead of what I typed. It is set up to access this data from Apple Health and is fine on the website.
Maybe this info will help.
Oh wow… thanks so much. For sure this sounds like it will help.
The only app connected to my account is rungap, also my weight don’t change and its without a comma.
So I don’t think that’s the issue.
Today it also happened in Slope mode, at the end of my workout I did a short push, no change in elevation.
And it happened exactly when the interval ended, aka the same as in ERG mode, where it happens at every interval change.
The funny thing is, when I went back to the app/workout, the time was still running, after the workout should have finished, and the interval was counting down from start again.
I finished the workout (pressed stop), and the workout time only showed the original planned workout time, aka not the extra 5-6 seconds because of the failure.
Edit 11 of March:
I reinstalled the app.
Today pure Z2 in Slope mode, no failure.
Hi Alex,
I’ve just tried to perform a workout. Wahoo Kickr Snap, iPhone 15 Pro.
As others are reporting the app crashes when power changes
I’ve had no problems previously, but I have updated both Trainer Day and Wahoo apps since last session.
Hope your folks can sort it as it’s unrideable like this.
Many thanks
We will for sure fix it. The question is how fast… It’s really a strange one since we have many thousands of people recording workouts weekly yet only a couple seem to be affected by this. I am sure it is our bug and we consider it top priority because losing workouts is the worst. Or wondering about losing is pretty bad too.
I pointed AI to this post and asked for suggestions. The only thing it suggested that was new was the following:
Reset Permissions and Clear Data
After trying this, I tried a 30 min recover ride to test and had no crashes until about 17 min in, then 3 more crashes in the remaining time. I thought this fixed it but it did improve. Not sure if this points to a memory leak in the app, but it is more data for you. You can see the app crashing in the chart of my workout where the power drops out while I reopen app and resume workout.
Nice sleuthing… too bad nothing came up. I just tried a workout on my mac M1 with no issues to 30 minutes. We have checked memory leaks.
No
I have an apple watch, but I do not connect it to TrainderDay iPad app or even see it as an option.
Not sure if this is helpful but I found the following logs for TrainerDay dated today - but I am unable to attach them they are .ips - I changed them to .gif temporally but even though that is allowed to upload it didn’t like my files. If there is a support email address, i will gladly email them.
Some additional sleuthing I pulled 4 logs from today for Trainer day on the iPAD - I am not sure if there is any useful info but they are attached.
@Loovery I just sent the logs. Thank you!
Edit: in addition I was able to attach iPad to Mac and run the console in Xcode to capture the crash log. I just sent that via email. AI (grok) has the following take on the log:
Thank you for providing the crash log for the TrainerDay app on your iPad Pro M4 running iOS 18.3.2. As Grok 3, built by xAI, I’ve analyzed the log to identify the likely cause of the crash and will recommend steps to resolve or mitigate the issue. Let’s break it down step by step.
EXC_BAD_ACCESS (SIGSEGV) with subtype KERN_INVALID_ADDRESS at address 0x8000000000000010.SIGNAL 11 Segmentation fault: 11.com.apple.main-thread).0x8000000000000010 suggests a possible pointer authentication failure, a security feature in ARM64e architectures like the M4 chip. This could mean the app mishandled a signed pointer, leading to a crash.TrainerDay (frames 0 and 1), followed by CoreBluetooth frames (2-6).-[CBPeripheral handleCharacteristicEvent:characteristicSelector:delegateSelector:delegateFlag:] (frame 3) indicates the crash happened during a Bluetooth characteristic event, likely when processing data from your bike.The crash is most likely due to a bug in TrainerDay’s handling of Bluetooth data from the Schwinn IC4. Specifically:
The call stack’s involvement of CoreBluetooth points to the interaction with your bike as the trigger, aligning with your ride chart showing crashes during active use.
EXC_BAD_ACCESS and CoreBluetooth stack trace to identify and patch the pointer or Bluetooth handling bug.The crash stems from a pointer authentication failure in TrainerDay 5.2.2 while handling Bluetooth data, possibly exacerbated by the M4 chip and iOS 18.3.2. Start with workarounds like reducing Bluetooth devices or workout complexity, then escalate to TrainerDay support with this log. They’re the best positioned to fix this, especially given the hardware-specific nature of the issue.
Let me know if you try these steps or get a response from support—I can refine the advice further!
I had this exact problem yesterday. Every time the interval power changed on ERG mode the app crashed. Happened at least 15 times during the workout. I’m using an older iPad Pro 12.1 and a Tacx trainer.