Apple mail keeps crashing - lidArgumentException

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OS 10.15.7, Mail Version 13.4 (3608.120.23.2.7)

That is it, it crashes. There seems to be no pattern to it. And I get the following message:

Exception Name: NSInvalidArgumentException

Description: *** -[NSProgress resignCurrent]: NSProgress was not the current progress on this thread <NSThread: 0x600000dc4c80>{number = 1, name = main}

User Info: (null)



0 CoreFoundation 0x00007fff2e692627 __exceptionPreprocess + 250

1 libobjc.A.dylib 0x00007fff6752b5bf objc_exception_throw + 48

2 Foundation 0x00007fff30d166f7 -[NSProgress _addCompletedUnitCount:] + 0

3 Mail 0x000000010d763c05 Mail + 875525

4 EmailFoundation 0x00007fff490d0ce0 __28-[EFFuture addSuccessBlock:]_block_invoke + 37

5 EmailFoundation 0x00007fff490d0a4d -[EFFuture _flushCompletionBlocks] + 256

6 EmailFoundation 0x00007fff490d0909 -[EFFuture finishWithResult:error:] + 190

7 EmailFoundation 0x00007fff490d0846 -[EFFuture finishWithResult:] + 19

8 Mail 0x000000010d7753ca Mail + 947146

9 libdispatch.dylib 0x00007fff686796c4 _dispatch_call_block_and_release + 12

10 libdispatch.dylib 0x00007fff6867a658 _dispatch_client_callout + 8

11 libdispatch.dylib 0x00007fff68685cab _dispatch_main_queue_callback_4CF + 936

12 CoreFoundation 0x00007fff2e655911 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9

13 CoreFoundation 0x00007fff2e615717 __CFRunLoopRun + 2028

14 CoreFoundation 0x00007fff2e6148ce CFRunLoopRunSpecific + 462

15 HIToolbox 0x00007fff2d240abd RunCurrentEventLoopInMode + 292

16 HIToolbox 0x00007fff2d2407d5 ReceiveNextEventCommon + 584

17 HIToolbox 0x00007fff2d240579 _BlockUntilNextEventMatchingListInModeWithFilter + 64

18 AppKit 0x00007fff2b887039 _DPSNextEvent + 883

19 AppKit 0x00007fff2b885880 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352

20 AppKit 0x00007fff2b87758e -[NSApplication run] + 658

21 AppKit 0x00007fff2b849396 NSApplicationMain + 777

22 libdyld.dylib 0x00007fff686d3cc9 start + 1





Any idea as to how to fix?
 
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