Xcode 12.2 on Big Sur: Crashing when opening Behaviors pane

Developer Tools & Services Xcode
satcol OP
Created Nov ’20
Replies 31
Boosts 0
Views 9.2k
Participants 30
After upgrading to Big Sur and Xcode 12.2, the app crashes every time I select the behaviors preference pane.

I can see the following error in the crash report:

Code Block 
ProductBuildVersion: 12B45b
Crashing on exception: The window has been marked as needing another Layout Window pass, but it has already had more Layout Window passes than there are views in the window. 
<NSPanel: 0x7f9a85f69130> 0x9ed (2541) {{545, 363}, {830, 552}} Behaviors en


Anyone else experiencing this?
Replies  31
Boosts  0
Views  9.2k
Participants  30
Kim il-Vec OP
Nov ’20
My MacBook Pro 16" (2020) crashed during installing Xcode 12.2.
ilyalevchenko OP
Nov ’20
UPD: solved. It was an issue on external Apple monitor. If I use xcode on laptop screen, all good

I have the same now but have crash immediately after clicking Xcode > Preferences
daniela-empathy-co OP
Nov ’20
Same issue here, 

Code Block ProductBuildVersion: 12B45b
Crashing on exception: The window has been marked as needing another Layout Window pass, but it has already had more Layout Window passes than there are views in the window. 
<NSPanel: 0x7fed210721d0> 0xd4a (3402) {{-6175, 1240}, {830, 552}} Behaviors en


On Macbook Pro 16-inch 2019 , macOs Big Sur 11.0.1 & xCode 12.2. Crashed every time you trying to open ( Xcode > preferences , Product > Scheme > Manage Schemes, etc ...) on external display. If you do this ,in laptop screen works fine.
shufflingB OP
Nov ’20
Similar issue with Xcode here:

1) Displaying on the MBP's built in screen, the Preferences window opens without crashing.

2) Try the same on either of my two external, non-Apple monitors, then Xcode crashes.
RDJin OP
Nov ’20
My MacBook pro 13" (running Big Sur) is crashing when I try to update Xcode from 12.0.1 to 12.2.

I tried to update Xcode 3 times from app store; and every time my mac crashed.

Does anyone knows how to solve this issue?


sigob OP
Nov ’20
My MacBook Pro (15-inch, 2018) after Update Big Sur 11.0.1 and try install Xcode 12.2 from Apple Store, crashing in every 4 times. I stopped in my work :(
asanokatana OP
Nov ’20
As others have noted, this behavior also only seems to happen for me when using XCode on an external monitor, not if XCode is used on the MBP monitor. It seems like Big Sur has numerous little compatibility issues with external monitors (I was having bad flickering issues and it seemed to be a conflict with a Wacom tablet driver). I sort of wonder if it's a change they made in Big Sur to accommodate M1 as M1 can only handle one external (I have two). Funny thing is, it only crashes when clicking "Behaviors" when I have both externals connected, but I tried unplugging one external and using only one (so as if I had an M1) and it crashes on Preferences alone. I opened XCode and clicked Preferences > Behaviors to crash it a few times just to send a few reports hopefully they notice lol.
ejupialked OP
Nov ’20
I have the same issue when using Xcode with an external monitor. The app starts slowing down and sometimes it freezes the entire OS. I’m using a MacBook Pro 16” 32GB i7. The situation improves if I close the lid though.
PrimeCoder OP
Dec ’20
I do have this exact same problem. I tried this on both Xcode 12.2 (12B45b) and 12.3 beta (12C5020f).
I tested this on Macbook Pro (2020, 32 GB RAM)

  • Open Xcode on external monitor

  • Open Preferences tab -> Crashed

  • Open Xcode again on external monitor, dragged it to build-in monitor (macbookpro)

  • Open Preferences tab -> OK

  • Drag Xcode back to external monitor

  • Open preferences tab -> Crashed

??!!!
Please fix. Thank you.
Surepic OP
Dec ’20
Xcode 12.3 big sur 11.1
previews are crashing frequently
pdugg OP
Dec ’20
Yes, Xcode 12.3 still has this issue. Filed a bug report with Apple.
luo xiu OP
Dec ’20
Now deactivate "Main Thread Checker" in your Xcode project: Edit Scheme -> Run/Test -> Diagnostics -> Uncheck Main Thread Checker.
PAllenKing OP
Dec ’20
Same problem, filed bug report. Running Xcode 12.3, BigSur 11.1.
saee OP
Dec ’20
yes i had that problem since the first version of xcode12 and it's still there in 12.3
it seems to be a problem with secondary monitor. when i drag xcode back to the main monitor of my macbook i can work with preferences with no problem but behavior tab when on second monitor causes it to crash.
a3nv OP
Jan ’21
I would say it's not only an Xcode problem (but yeah, I have the same problem when I try to open the 'behavior' tab in preferences Xcode crashes on the external monitor. I've also noticed the same problem with the Wacom software. When I try to move 'Wacom Desktop Center' to an external monitor it also crashes with the same issue but when I use an external monitor as a main monitor application window can be displayed without any problem. It crashes only when I try to move windows from MBP built-in monitor to the external one (only one direction, the opposite works fine).

Anyway is there any update on this the issue persists for over a month already and I would say it's a major one.
murgen OP
Jan ’21
I got this one too.
xcode 12 (12.3 - 12C33) is generally very unstable...
crashing too often for a "professional tool" it a real pain to use it

still have these fixed sized text edit fields in many places of the user interface
particularly in the projet target settings page with the fields for bundle...

how apple , the champion of user experience, can provide such stuff... ?
teta-nuss OP
Jan ’21
I got exactly this error wehen starting TV.app and Musik.app under BigSur 11.1. on the seconf Screen or if the second screen is connected. If I remove the second screen verythings work sind. Before BigSur (Catalina) everything worked fine... This is really strange... (It's a 2016 MBP)
BrandonMFong OP
Jan ’21
I am getting this error as well. I am running Xcode 12.3(12C33) on macOS Big Sur 11.1. I was able to open the preferences window if I am doing it from the main Xcode window. When I am in a project, clicking the preferences just crashes.
farithjhg OP
Jan ’21
I got the same error with Xcode 12.3 on big sur when I try to add the APPLE ID account.

ProductBuildVersion: 12C33
Crashing on exception: The window has been marked as needing another Layout Window pass, but it has already had more Layout Window passes than there are views in the window.
<NSPanel: 0x7fc61fa8b810> 0x5a91 (23185) {{1656, -17}, {830, 552}} Behaviors en
carleek OP
Jan ’21
I got this error with Xcode 12.4. Interestingly, I only get the crash when trying to access the Behaviors tab when Xcode is on my Thunderbolt Display (connected via the lightning connector to a lightning to USB-C adaptor). I've tested this both on my 2019 MBP (via the adapter) and on an older 2015 MBP (no adapter needed). Both MBP are running macOS 11.1.

However (and this is where things get spicy) I have a third monitor connected (an LG, via a USBC to HDMI). I am able to open the Behaviors tab on this monitor just fine. Adding some habanero to the mix is that you can open the Behaviors on a save screen (for me its the MBP main monitor or my LG) then drag Xcode to the Thunderbolt Display (the crashing screen). This leaves the preference pane on the safe screen. Xcode doesn't crash until I drag the preference panel over to the crashing screen. As soon as that happens, poof! Xcode crashes... Like magic...!
endres OP
Jan ’21
Well. Bizarre about the external monitor thing. For all of you having this, do you also see an empty Components tab which prevents you from downloading simulators?
odeen1701 OP
Jan ’21
Had a problem opening the xib files or storyboard files. Whenever I tried to open it, Xcode crashed.

Solved it when I created a new storyboard and Xcode presented it, right afterwards any other interface builder file opened normally.
plfoley OP
Jan ’21
It is just the action of displaying the Preferences panel with the Behaviour tab selected on an external monitor that triggers the crash.

1 - Open XCode on the laptop monitor.
2 - Open Preferences
3 - Select the Behaviour Tab
4 - Drag the Preference panel over to the external monitor.
5 - XCode --> Splat!

By the way, the next time you will open the Preference panel, the Behaviour tab will be displayed and XCode will crash if you have it displayed in your external monitor. So make sure to open XCode on your laptop monitor and select any other tab in the preference panel.
burritobrah OP
Feb ’21
Like several of you, I am also crashing on the new MacBook M1 after switching over opening storyboards or trying to add simulators. Adding a new storyboard crashed as well. The simulator panel is blank, and adding one crashes Xcode.
CPSoftware OP
Feb ’21
I got the same problem - Xcode 12 (12D4e) and have several projects in development. Very annoying and could even get me fired from my independent development job. What say you, Apple???
Xcode 12.2 on Big Sur: Crashing when opening Behaviors pane
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