# Bug Report: APC40 "clip/dev" (option) key crashes Liberation when selecting empty clip **URL:** \ **Category:** Bug reports\ **Created:** [15 April 2026 13:12 UTC](https://forum.liberationlaser.com/t/bug-report-apc40-clip-dev-option-key-crashes-liberation-when-selecting-empty-clip/2154 "2026-04-15T13:12:38Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Afturmath](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.liberationlaser.com/afturmath/32/1018_2.png) [@Afturmath](https://forum.liberationlaser.com/u/Afturmath)\ **Post date:** [15 April 2026 13:12 UTC](https://forum.liberationlaser.com/t/bug-report-apc40-clip-dev-option-key-crashes-liberation-when-selecting-empty-clip/2154/1 "2026-04-15T13:12:38Z")
# Bug Report Template Please fill in each section as thoroughly as possible Summary: **Platform (please specify Windows or MacOS):** Both (thanks to @mrfloppy88 for testing on Windows) **Liberation version number:** 1.0.3b4, 1.0.3b5 **Operating System Version:** MacOS Tahoe, MacOS Mojave, Windows 11 **Details of laser DACs connected (number, type, connection method):** N/A # Description When selecting an empty clip slot on the APC40 while holding the “clip/dev view” (option) key, Liberation will crash with an error message. I found this while trying to test if I could hold option to copy a clip using the APC40, but it would be problematic if a user accidentally pressed an empty clip slot while trying to select a clip without activating it. Video: [https://www.youtube.com/watch?v=tJL0fDSaptU](https://www.youtube.com/watch?v=tJL0fDSaptU) ## Steps to reproduce Hold down the “clip/dev view” key on APC40 and select an empty clip slot. ## Screenshot ![Liberation Crash APC40 Empty Clip](https://europe1.discourse-cdn.com/flex017/uploads/liberation/original/2X/a/ad8538d3c91101becd1279ba8cd99e7062d5e8b3.png) ## Notes _If you can please share your project file (.lprj) or zip up your data folder - the path is displayed in the About window. If you have a crash report please do not send it to Apple or Microsoft (I don’t get those). Instead copy paste it._ This crash occurs regardless of the project file used. Crashlog: ```auto === Crash Detected (Signal 11) === 0 Liberation 0x0000000103033b5c _ZN8Timeline13sortAlgorithmERNSt3__110shared_ptrI19TimelineElementBaseEES4_ + 1025020 1 libsystem_platform.dylib 0x000000018ba49a24 _sigtramp + 56 2 Liberation 0x0000000102f6c92c _ZN8Timeline13sortAlgorithmERNSt3__110shared_ptrI19TimelineElementBaseEES4_ + 209356 3 Liberation 0x0000000103221800 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 70644 4 Liberation 0x0000000102f204e4 _ZN11ofParameterIiE14eventsSetValueERKi + 2352 5 Liberation 0x0000000103220c98 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 67724 6 Liberation 0x000000010321bdd4 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 47560 7 CoreMIDI 0x00000001a5615ac4 _ZN4MIDI14PacketizerBaseINS_16LegacyPacketListEED2Ev + 60 8 CoreMIDI 0x00000001a56158b8 _ZN4MIDI24MIDIPacketList_DelivererclEPKNS_9EventListE + 172 9 CoreMIDI 0x00000001a561a788 _ZN11MIDIProcess16MIDIInPortThread3RunEv + 440 10 CoreMIDI 0x00000001a5617a64 _ZN12CADeprecated7XThread9RunHelperEPv + 48 11 CoreMIDI 0x00000001a56196c0 _ZN12CADeprecated9CAPThread5EntryEPS0_ + 92 12 libsystem_pthread.dylib 0x000000018ba1a034 _pthread_start + 136 13 libsystem_pthread.dylib 0x000000018ba14e3c thread_start + 8 === Crash Detected (Signal 11) === 0 Liberation 0x00000001004c3b5c _ZN8Timeline13sortAlgorithmERNSt3__110shared_ptrI19TimelineElementBaseEES4_ + 1025020 1 libsystem_platform.dylib 0x0000000186361a24 _sigtramp + 56 2 Liberation 0x00000001003fc92c _ZN8Timeline13sortAlgorithmERNSt3__110shared_ptrI19TimelineElementBaseEES4_ + 209356 3 Liberation 0x00000001006b1800 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 70644 4 Liberation 0x00000001003b04e4 _ZN11ofParameterIiE14eventsSetValueERKi + 2352 5 Liberation 0x00000001006b0c98 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 67724 6 Liberation 0x00000001006abdd4 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 47560 7 CoreMIDI 0x000000019ff2dac4 _ZN4MIDI14PacketizerBaseINS_16LegacyPacketListEED2Ev + 60 8 CoreMIDI 0x000000019ff2d8b8 _ZN4MIDI24MIDIPacketList_DelivererclEPKNS_9EventListE + 172 9 CoreMIDI 0x000000019ff32788 _ZN11MIDIProcess16MIDIInPortThread3RunEv + 440 10 CoreMIDI 0x000000019ff2fa64 _ZN12CADeprecated7XThread9RunHelperEPv + 48 11 CoreMIDI 0x000000019ff316c0 _ZN12CADeprecated9CAPThread5EntryEPS0_ + 92 12 libsystem_pthread.dylib 0x0000000186332034 _pthread_start + 136 13 libsystem_pthread.dylib 0x000000018632ce3c thread_start + 8 === Crash Detected (Signal 11) === 0 Liberation 0x0000000100773b5c _ZN8Timeline13sortAlgorithmERNSt3__110shared_ptrI19TimelineElementBaseEES4_ + 1025020 1 libsystem_platform.dylib 0x0000000186361a24 _sigtramp + 56 2 Liberation 0x00000001006ac92c _ZN8Timeline13sortAlgorithmERNSt3__110shared_ptrI19TimelineElementBaseEES4_ + 209356 3 Liberation 0x0000000100961800 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 70644 4 Liberation 0x00000001006604e4 _ZN11ofParameterIiE14eventsSetValueERKi + 2352 5 Liberation 0x0000000100960c98 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 67724 6 Liberation 0x000000010095bdd4 _ZN14ColourGradient9lessByPosERK10ColourStopS2_ + 47560 7 CoreMIDI 0x000000019ff2dac4 _ZN4MIDI14PacketizerBaseINS_16LegacyPacketListEED2Ev + 60 8 CoreMIDI 0x000000019ff2d8b8 _ZN4MIDI24MIDIPacketList_DelivererclEPKNS_9EventListE + 172 9 CoreMIDI 0x000000019ff32788 _ZN11MIDIProcess16MIDIInPortThread3RunEv + 440 10 CoreMIDI 0x000000019ff2fa64 _ZN12CADeprecated7XThread9RunHelperEPv + 48 11 CoreMIDI 0x000000019ff316c0 _ZN12CADeprecated9CAPThread5EntryEPS0_ + 92 12 libsystem_pthread.dylib 0x0000000186332034 _pthread_start + 136 13 libsystem_pthread.dylib 0x000000018632ce3c thread_start + 8 ``` ---
**Author:** ![seb](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.liberationlaser.com/seb/32/3_2.png) [@seb](https://forum.liberationlaser.com/u/seb)\ **Post date:** [15 April 2026 14:25 UTC](https://forum.liberationlaser.com/t/bug-report-apc40-clip-dev-option-key-crashes-liberation-when-selecting-empty-clip/2154/2 "2026-04-15T14:25:05Z")
Good catch! Fixed in the next release, thanks!