I have the exact issue. My app is installing fine on several iphones but the same crashes at startup. Running the app manually from Xcode produces this on the console :
2018-10-24 16:30:34.984717+0700 Runner[9026:1109274] [VERBOSE-2:dart_vm.cc(263)] VM snapshot must be valid.
2018-10-24 16:30:34.984844+0700 Runner[9026:1109274] [VERBOSE-3:shell.cc(216)] Check failed: vm. Must be able to initialize the VM.
Anyone have idea to fix it ?