To reproduce:

• open HackStudio
• click on Debug button

Crashes here:

ASSERTION FAILED: !!m_debug_session
../../Userland/DevTools/HackStudio/Debugger/Debugger.cpp:116

The issue seems to be that upon opening HackStudio the projects root_path is / by default. When Debug is requested it will call HackStudioWidget::create_debug_action(). This contains a check here:

But Core::File::exists("///") will return true and thus bypass all checks and attempt to start debugger thread (note get_project_executable_path() for / returns ///).

Could a simple check that get_project_executable_path() is a file be enough to solve this?

Relevant backtrace:

CrashDaemon(20:20): 0x3e3c11ce: [libsystem.so] syscall2 +0xe (syscall.cpp:25)
CrashDaemon(20:20): 0x4c78e185: [libc.so] raise +0x25 (signal.cpp:21)
CrashDaemon(20:20): 0x4c7772c6: [libc.so] abort +0x2a (stdlib.cpp:233)
CrashDaemon(20:20): 0x4c777e2b: [libc.so] __assertion_failed +0xeb (Format.h:236)
CrashDaemon(20:20): 0x9480aebd: [/bin/HackStudio] HackStudio::Debugger::start() +0x40d (RefCounted.h:99)
CrashDaemon(20:20): 0x9480af35: [/bin/HackStudio] HackStudio::Debugger::start_static() +0x25 (Debugger.cpp:106)
CrashDaemon(20:20): 0x95f54665: [libthreading.so] Threading::Thread::start()::{lambda(void*)#1}::_FUN(void*) +0x55 (Function.h:91)
CrashDaemon(20:20): 0x2d54f0e6: [libpthread.so] pthread_create_helper +0x36 (pthread.cpp:49)