Lightroom 2015.6: Guided Transform tool crashes if you click instead of drag

So here's my first experience with guided tool.  I didn't watch the video, just tried clicking.  Crash.  After watching the video, I know that you need to drag, but bugs like this make you look really silly.

Here's a traceback of what happens if you just click.

2016-06-09 11:18:45.567 Adobe Lightroom[28266:4356646] 

?:0: attempt to index field '_dragNewGuidePointB' (a nil value)

    0:          [unnamed]                      - 1456519718:2298+375

    1: method   start                          - 1902707063:202+3

    2: field    mouseDown                      - 1456519718:2101+193

    3:          [unnamed]                      - 1628984358:3788+14

---------------------------------

2016-06-09 11:18:45.568 Adobe Lightroom[28266:4356646] ?:0: attempt to index field '_dragNewGuidePointB' (a nil value)

2016-06-09 11:18:45.569 Adobe Lightroom[28266:4356646] (

	0   CoreFoundation                      0x00007fff89aa14f2 __exceptionPreprocess + 178

	1   libobjc.A.dylib                     0x00007fff87b8ff7e objc_exception_throw + 48

	2   CoreFoundation                      0x00007fff89aa1439 -[NSException raise] + 9

	3   AgKernel                            0x0000000102fc8e17 AgTransitQueue_enqueueToQueue + 3946

	4   AgKernel                            0x0000000102fccadb AgExceptions_setThrowHook + 230

	5   AgKernel                            0x0000000102fb06f8 lua_gethalts + 524

	6   AgKernel                            0x0000000102faf781 lua_getinfo + 4182

	7   AgKernel                            0x0000000102fbe530 luaopen_table + 3358

	8   AgKernel                            0x0000000102fbf9a4 luaopen_table + 8594

	9   AgKernel                            0x0000000102fb10e1 lua_gethalts + 3061

	10  AgKernel                            0x0000000102fa90f1 lua_call + 37

	11  AgUI                                0x0000000103015e19 reorderChildWindows + 21873

	12  AgUI                                0x0000000103016e30 reorderChildWindows + 25992

	13  AgUI                                0x0000000103017379 reorderChildWindows + 27345

	14  AppKit                              0x00007fff978193c9 -[NSWindow _handleMouseDownEvent:isDelayedEvent:] + 6322

	15  AppKit                              0x00007fff9781a3ad -[NSWindow _reallySendEvent:isDelayedEvent:] + 212

	16  AppKit                              0x00007fff97259539 -[NSWindow sendEvent:] + 517

	17  AppKit                              0x00007fff971d9a38 -[NSApplication sendEvent:] + 2540

	18  AgUI                                0x0000000103065eaa AgColorUtils_sampleScreen_L + 6491

	19  AppKit                              0x00007fff97040df2 -[NSApplication run] + 796

	20  AppKit                              0x00007fff9700a368 NSApplicationMain + 1176

	21  Adobe Lightroom                     0x0000000102f890ae main + 974

	22  libdyld.dylib                       0x00007fff8437a5ad start + 1

)