Running my JavaFX application with JavaFX 11 on OpenJDK 11 I run into the following crash sometimes when a child stage is shown:

2018-09-25 20:19:43.811 java[36687:13092655] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: _type > 0 && _type <= kCGSLastEventType'
*** First throw call stack:
(
        0 CoreFoundation 0x00007fff51e6743d __exceptionPreprocess + 256
        1 libobjc.A.dylib 0x00007fff7dd74720 objc_exception_throw + 48
        2 CoreFoundation 0x00007fff51e8208e +[NSException raise:format:arguments:] + 98
        3 Foundation 0x00007fff5421e55d -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 194
        4 AppKit 0x00007fff4f30dacd -[NSEvent _initWithCGEvent:eventRef:] + 3272
        5 AppKit 0x00007fff4f661188 +[NSEvent eventWithCGEvent:] + 120
        6 libglass.dylib 0x0000000130a98f3b listenTouchEvents + 59
        7 SkyLight 0x00007fff77e32782 _ZL19processEventTapDataPvjjjPhj + 148
        8 SkyLight 0x00007fff77d31bb2 _XPostEventTapData + 278
        9 SkyLight 0x00007fff77e32690 _ZL22eventTapMessageHandlerP12__CFMachPortPvlS1_ + 132
        10 CoreFoundation 0x00007fff51dc5a5b __CFMachPortPerform + 246
        11 CoreFoundation 0x00007fff51dc5959 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
        12 CoreFoundation 0x00007fff51dc58b7 __CFRunLoopDoSource1 + 527
        13 CoreFoundation 0x00007fff51dad945 __CFRunLoopRun + 2574
        14 CoreFoundation 0x00007fff51dacce4 CFRunLoopRunSpecific + 463
        15 HIToolbox 0x00007fff51046895 RunCurrentEventLoopInMode + 293
        16 HIToolbox 0x00007fff510465cb ReceiveNextEventCommon + 618
        17 HIToolbox 0x00007fff51046348 _BlockUntilNextEventMatchingListInModeWithFilter + 64
        18 AppKit 0x00007fff4f30395b _DPSNextEvent + 997
        19 AppKit 0x00007fff4f3026fa -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1362
        20 AppKit 0x00007fff4f54ed6a -[NSApplication _doModalLoop:peek:] + 418
        21 AppKit 0x00007fff4f54d7e0 __35-[NSApplication runModalForWindow:]_block_invoke_2 + 64
        22 AppKit 0x00007fff4f54d78d __35-[NSApplication runModalForWindow:]_block_invoke + 73
        23 AppKit 0x00007fff4f54cff8 _NSTryRunModal + 100
        24 AppKit 0x00007fff4f54cedb -[NSApplication runModalForWindow:] + 128
        25 AppKit 0x00007fff4fa6973f -[NSPrintPanel runModalWithPrintInfo:] + 534
        26 libawt_lwawt.dylib 0x00000001374804bd __25-[PrintModel runJobSetup]_block_invoke + 62
        27 Foundation 0x00007fff541a2cdb __NSThreadPerformPerform + 327
        28 CoreFoundation 0x00007fff51dca405 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
        29 CoreFoundation 0x00007fff51dca3ab __CFRunLoopDoSource0 + 108
        30 CoreFoundation 0x00007fff51dade51 __CFRunLoopDoSources0 + 195
        31 CoreFoundation 0x00007fff51dad3fa __CFRunLoopRun + 1219
        32 CoreFoundation 0x00007fff51dacce4 CFRunLoopRunSpecific + 463
        33 Foundation 0x00007fff5410d5da -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 280
        34 libglass.dylib 0x0000000130a8d9f5 +[GlassApplication enterNestedEventLoopWithEnv:] + 165
        35 libglass.dylib 0x0000000130a8e48a Java_com_sun_glass_ui_mac_MacApplication__1enterNestedEventLoopImpl + 74
        36 ??? 0x00000001146ef950 0x0 + 4637784400
)
libc++abi.dylib: terminating with uncaught exception of type NSException