# Crash in Scaler 3.2.1 when using ‘Add to Progression’ in Ableton Live 12.3.6 on macOS, causing Live to terminate with a segmentation fault. **URL:** \ **Category:** Bug Reports\ **Tags:** AbletonLive, Mac\ **Created:** [April 3, 2026, 7:40pm UTC](https://forum.scalermusic.com/t/crash-in-scaler-3-2-1-when-using-add-to-progression-in-ableton-live-12-3-6-on-macos-causing-live-to-terminate-with-a-segmentation-fault/24638 "2026-04-03T19:40:29Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mirco](https://avatars.discourse-cdn.com/v4/letter/m/9e8a1a/32.png) [@mirco](https://forum.scalermusic.com/u/mirco)\ **Post date:** [April 3, 2026, 7:40pm UTC](https://forum.scalermusic.com/t/crash-in-scaler-3-2-1-when-using-add-to-progression-in-ableton-live-12-3-6-on-macos-causing-live-to-terminate-with-a-segmentation-fault/24638/1 "2026-04-03T19:40:29Z")
Hi, I’m experiencing a repeatable crash of Scaler 3.2.1 when using the **“Add to Progression”** function inside Ableton Live. **Environment** - Scaler version: 3.2.1 - DAW: Ableton Live 12.3.6 (Suite) - OS: macOS 26.4 (ARM, Apple Silicon) - Plugin format: VST (loaded in Ableton’s VST folder) **Steps to reproduce** 1. Create a MIDI track in Ableton Live 12.3.6. 2. Load Scaler 3.2.1 on that track. 3. Detect/choose a scale and chords as normal. 4. Right‑click an individual chord and choose **“Add to Progression”** (or the equivalent menu entry that appends/duplicates clips at the end of the track). 5. As soon as the action is triggered, Ableton Live immediately crashes. **Observed behavior** - Live quits instantly with a segmentation fault (EXC\_BAD\_ACCESS / SIGSEGV). - The macOS crash report shows the crash on the **main thread** , inside Scaler’s sequencer code when handling the chord menu action. - After the crash, reopening the same project and repeating the operation causes the same behavior. **Relevant portion of the crash report** On the main thread I see: - `Exception Type: EXC_BAD_ACCESS (SIGSEGV)` - `Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000118` Backtrace excerpt (thread that crashed): - `Scaler::Core::Sequencer::Track::getClipLength(unsigned int) const` - `Scaler::Core::Sequencer::copyClipsAtEndOfTrack(...)` - `Scaler::UI::Components::ChordComponent::handleMenu(int)` This looks like Scaler is trying to access a clip length from an invalid or null object when duplicating/adding clips at the end of the track as part of the chord menu action. I have attached the complete macOS crash report file (Scaler3\_AbletonLive12\_crash\_report.txt) so you can see the full backtrace and system details. [Scaler3\_AbletonLive12\_crash\_report.txt](https://forum.scalermusic.com/uploads/short-url/azV5RZVgwbQPCPPRA3faqh3GxdF.txt) (192.8 KB) ---
**Author:** ![davide](https://yyz2.discourse-cdn.com/flex012/user_avatar/forum.scalermusic.com/davide/32/824_2.png) [@davide](https://forum.scalermusic.com/u/davide)\ **Post date:** [April 3, 2026, 7:48pm UTC](https://forum.scalermusic.com/t/crash-in-scaler-3-2-1-when-using-add-to-progression-in-ableton-live-12-3-6-on-macos-causing-live-to-terminate-with-a-segmentation-fault/24638/2 "2026-04-03T19:48:26Z")
Welcome to the community @mirco And thanks for the report. I can’t reproduce this following your steps, I am on exactly the same setup except for OS: macOS 26.4 (I’m on 15.7.5 Sequoia). We have Scaler 3.2.2 coming out within a week. I wonder if installing it, restarting your Mac and opening a vanilla session will resolve your issue? @Tristan Can you try on your end? ---
**Author:** ![mirco](https://avatars.discourse-cdn.com/v4/letter/m/9e8a1a/32.png) [@mirco](https://forum.scalermusic.com/u/mirco)\ **Post date:** [April 4, 2026, 7:17pm UTC](https://forum.scalermusic.com/t/crash-in-scaler-3-2-1-when-using-add-to-progression-in-ableton-live-12-3-6-on-macos-causing-live-to-terminate-with-a-segmentation-fault/24638/3 "2026-04-04T19:17:19Z")
Hey @davide no problem 🙂 Today I’ve not yet the same error but a different one. The stacktrace in attachments. [paste.txt](https://forum.scalermusic.com/uploads/short-url/b2fV6Em52HpOtd63cuwVFItGcy1.txt) (281.1 KB)