Deleting folder with Rule Status open makes UI unresponsive

Deleting folder with Rule Status open makes UI unresponsive with Remove Folder dialog on screen and buttons unresponsive.
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default 15:42:01.141511-0800 Hazel *** Assertion failure in -[NSTextFieldCell _objectValue:forString:errorDescription:], /AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1894.40.150/AppKit.subproj/NSCell.m:1417
error 15:42:01.141782-0800 Hazel Invalid parameter not satisfying: aString != nil
error 15:42:01.145723-0800 Hazel (
0 CoreFoundation 0x00007fff32302d07 __exceptionPreprocess + 250
1 libobjc.A.dylib 0x00007fff6b0265bf objc_exception_throw + 48
2 CoreFoundation 0x00007fff3232bec8 +[NSException raise:format:arguments:] + 88
3 Foundation 0x00007fff34a16f3d -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 191
4 AppKit 0x00007fff2f547cd5 -[NSCell _objectValue:forString:errorDescription:] + 300
5 AppKit 0x00007fff2f547b03 -[NSCell setStringValue:] + 44
6 AppKit 0x00007fff2f5c86f9 -[NSControl setStringValue:] + 121
7 Hazel 0x0000000103f3640e Hazel + 242702
8 Hazel 0x0000000103f1c39a Hazel + 136090
9 Hazel 0x0000000103f19324 Hazel + 123684
10 CoreFoundation 0x00007fff3227c9cf __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
11 CoreFoundation 0x00007fff3227c963 ___CFXRegistrationPost1_block_invoke + 63
12 CoreFoundation 0x00007fff3227c8d8 _CFXRegistrationPost1 + 372
13 CoreFoundation 0x00007fff3227c544 ___CFXNotificationPost_block_invoke + 80
14 CoreFoundation 0x00007fff3224c6bd -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1554
15 CoreFoundation 0x00007fff3224bb69 _CFXNotificationPost + 1351
16 Foundation 0x00007fff348c2866 -[NSNotificationCenter postNotificationName:object:userInfo:] + 59
17 Hazel 0x0000000103f53498 Hazel + 361624
18 Hazel 0x0000000103f598e7 Hazel + 387303
19 CoreFoundation 0x00007fff3227c9cf __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
20 CoreFoundation 0x00007fff3227c963 ___CFXRegistrationPost1_block_invoke + 63
21 CoreFoundation 0x00007fff3227c8d8 _CFXRegistrationPost1 + 372
22 CoreFoundation 0x00007fff3227c544 ___CFXNotificationPost_block_invoke + 80
23 CoreFoundation 0x00007fff3224c6bd -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1554
24 CoreFoundation 0x00007fff3224bb69 _CFXNotificationPost + 1351
25 Foundation 0x00007fff348c2866 -[NSNotificationCenter postNotificationName:object:userInfo:] + 59
26 AppKit 0x00007fff2f65100b -[NSTableView _sendSelectionChangedNotificationForRows:columns:] + 221
27 AppKit 0x00007fff2f5d85a9 -[NSTableRowData _updateVisibleViewsBasedOnUpdateItems] + 4773
28 AppKit 0x00007fff2f5d71b6 -[NSTableRowData _updateVisibleViewsBasedOnUpdateItemsAnimated] + 224
29 AppKit 0x00007fff2f5b44f2 -[NSTableRowData _doWorkAfterEndUpdates] + 69
30 AppKit 0x00007fff2f5b6299 -[NSTableView _doUpdatedWorkWithHandler:] + 119
31 AppKit 0x00007fff2fbda7f9 -[NSOutlineView removeItemsAtIndexes:inParent:withAnimation:] + 238
32 Hazel 0x0000000103f55998 Hazel + 371096
33 Hazel 0x0000000103f54599 Hazel + 365977
34 AppKit 0x00007fff2f98c6e2 __54-[NSAlert beginSheetModalForWindow:completionHandler:]_block_invoke_2 + 22
35 AppKit 0x00007fff2fda453a NSWindowEndWindowModalSession + 187
36 AppKit 0x00007fff2f746437 -[NSApplication(NSResponder) sendAction:to:from:] + 299
37 AppKit 0x00007fff2f7462d2 -[NSControl sendAction:to:] + 86
38 AppKit 0x00007fff2f746204 __26-[NSCell _sendActionFrom:]_block_invoke + 136
39 AppKit 0x00007fff2f746106 -[NSCell _sendActionFrom:] + 171
40 AppKit 0x00007fff2f74604d -[NSButtonCell _sendActionFrom:] + 96
41 AppKit 0x00007fff2f74232b NSControlTrackMouse + 1745
42 AppKit 0x00007fff2f741c32 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 130
43 AppKit 0x00007fff2f741af1 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 691
44 AppKit 0x00007fff2f740e6d -[NSControl mouseDown:] + 748
45 AppKit 0x00007fff2f73f280 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 4914
46 AppKit 0x00007fff2f6a9a81 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2612
47 AppKit 0x00007fff2f6a8e29 -[NSWindow(NSEventRouting) sendEvent:] + 349
48 AppKit 0x00007fff2f6a71b4 -[NSApplication(NSEvent) sendEvent:] + 352
49 AppKit 0x00007fff2f4f421f -[NSApplication run] + 707
50 AppKit 0x00007fff2f4c5ff6 NSApplicationMain + 777
51 libdyld.dylib 0x00007fff6c1cdcc9 start + 1
52 ??? 0x0000000000000001 0x0 + 1
)