Panda crashes when we start with a dot . either in Header or Table

Testing version: 2595

What were you doing: start with a dot (.) in either in header or table it will crash.
What feature did you use: Headings, Tables

What happened: Crashed Multiple times

What did you expect to happen: Should work normally

Here is sample crash report

Translated Report (Full Report Below)

Process: Panda [26244]
Path: /Applications/Panda.app/Contents/MacOS/Panda
Identifier: net.shinyfrog.panda
Version: 1.0 (2595)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
User ID: 501

Date/Time: 2022-01-07 01:33:22.1077 -0500
OS Version: macOS 12.1 (21C52)
Report Version: 12
Anonymous UUID: 09E0204E-547D-60AF-A18F-5F6115C79119

Sleep/Wake UUID: 06043928-AE4C-4CF0-B6F3-C81379154ECA

Time Awake Since Boot: 760000 seconds
Time Since Wake: 20698 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Application Specific Information:
Assertion failed: (pos_ > minPos_), function unsafePeekPreviousCharacter, file /Users/whamoo/git/Panda/Externals/MDTextEditor/PolarMark/IceMark/src/Go.h, line 53.

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x19ccf59b8 __pthread_kill + 8
1 libsystem_pthread.dylib 0x19cd28eb0 pthread_kill + 288
2 libsystem_c.dylib 0x19cc66314 abort + 164
3 libsystem_c.dylib 0x19cc6572c __assert_rtn + 300
4 PolarMark 0x105137d3c Ice::Go::unsafePeekPreviousCharacter() (.cold.1) + 40
5 PolarMark 0x1050b146c Ice::Go::unsafePeekPreviousCharacter() + 44
6 PolarMark 0x1050b1214 Ice::Inline::Rules::Url::matchPreviousUnicodeDomain(Ice::GoLines&) + 72
7 PolarMark 0x1050afca8 Ice::Inline::Rules::Url::matchWithValidTopLevelDomain(Ice::Inline::InlineParser&, Ice::Node*, Ice::GoLines&) + 380
8 PolarMark 0x10512707c Ice::Inline::InlineParser::parseNode(Ice::Node*, Ice::Inline::InlineRuleMap&) + 404
9 PolarMark 0x105126ec8 Ice::Inline::InlineParser::parseBlock(Ice::Node*) + 80
10 PolarMark 0x1050e1314 Ice::Parser::parse(std::__1::basic_string<char16_t, std::__1::char_traits<char16_t>, std::__1::allocator<char16_t> > const&, Ice::RuleConfig&) + 176
11 PolarMark 0x1050bbe74 Ice::Tree::parse(std::__1::basic_string<char16_t, std::__1::char_traits<char16_t>, std::__1::allocator<char16_t> >, Ice::Node*) + 40
12 PolarMark 0x1050bc0b0 Ice::Tree::replace(Ice::Range, std::__1::basic_string<char16_t, std::__1::char_traits<char16_t>, std::__1::allocator<char16_t> > const&) + 364
13 PolarMark 0x1050ee8ec -[PMKAST replaceRange:withMarkdown:] + 276
14 MDTextKit 0x104fc6c38 -[MDTextStorage parseChangesUsingBlock:] + 468
15 MDTextKit 0x104fb6440 -[MDEditorController performStylingInTextView:withAutomaticTextChanges:] + 260
16 MDTextKitUI 0x104ab41ac 0x104a80000 + 213420
17 MDTextKitUI 0x104ab4b44 0x104a80000 + 215876
18 CoreFoundation 0x19cde9200 CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER + 28
19 CoreFoundation 0x19ce8cb84 ___CFXRegistrationPost_block_invoke + 52
20 CoreFoundation 0x19ce8caf0 _CFXRegistrationPost + 456
21 CoreFoundation 0x19cdb7eb0 _CFXNotificationPost + 720
22 Foundation 0x19dc6de3c -[NSNotificationCenter postNotificationName:object:userInfo:] + 96
23 AppKit 0x19fb5aef0 -[NSTextView(NSSharing) didChangeText] + 452
24 AppKit 0x19fb583a0 -[NSTextView _insertText:replacementRange:] + 2832
25 AppKit 0x19fb5733c -[NSTextInputContext(NSInputContext_WithCompletion) insertText:replacementRange:completionHandler:] + 188
26 AppKit 0x1a03216b0 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke_2.396 + 120
27 AppKit 0x19fb57274 -[NSTextInputContext do_HandleTSMEvent_insertFixLenTextLoop:whileCondition:dispatchWorkEach:afterEachInsertText:continuation:] + 164
28 AppKit 0x19fb570d0 -[NSTextInputContext tryHandleTSMEvent_insertFixLenText_withContext:dispatchCondition:setupForDispatch:nestedWorkaroundCondition:nestedWorkaroundDispatchWork:loopCondition:dispatchWorkEach:afterEachInsertText:continuation:] + 380
29 AppKit 0x1a032106c __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke.341 + 2928
30 AppKit 0x19fb56c70 __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke_2 + 108
31 AppKit 0x19fb56bb4 -[NSTextInputContext tryHandleTSMEvent_HasMarkedText_withDispatchCondition:dispatchWork:continuation:] + 148
32 AppKit 0x19fb56060 -[NSTextInputContext handleTSMEvent:completionHandler:] + 2004
33 AppKit 0x19fb55810 _NSTSMEventHandler + 340
34 HIToolbox 0x1a595d418 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1116
35 HIToolbox 0x1a595c884 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 356
36 HIToolbox 0x1a595c714 SendEventToEventTargetWithOptions + 44
37 HIToolbox 0x1a59bad54 SendTSMEvent_WithCompletionHandler + 432
38 HIToolbox 0x1a59bb298 __SendUnicodeTextAEToUnicodeDoc_WithCompletionHandler_block_invoke + 440
39 HIToolbox 0x1a59bb0b4 __SendFilterTextEvent_WithCompletionHandler_block_invoke + 224
40 HIToolbox 0x1a59badac SendTSMEvent_WithCompletionHandler + 520
41 HIToolbox 0x1a59bab5c SendFilterTextEvent_WithCompletionHandler + 256
42 HIToolbox 0x1a59ba788 SendUnicodeTextAEToUnicodeDoc_WithCompletionHandler + 292
43 HIToolbox 0x1a59ba524 __utDeliverTSMEvent_WithCompletionHandler_block_invoke_2 + 320
44 HIToolbox 0x1a59ba2a8 __utDeliverTSMEvent_WithCompletionHandler_block_invoke + 284
45 HIToolbox 0x1a59ba10c TSMKeyEvent_WithCompletionHandler + 600
46 HIToolbox 0x1a59b9e94 __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_4 + 320
47 HIToolbox 0x1a59b9ca4 __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_3 + 352
48 HIToolbox 0x1a59b99a0 __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_2 + 352
49 HIToolbox 0x1a59b969c __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke + 344
50 HIToolbox 0x1a59a7b84 TSMProcessRawKeyEventWithOptionsAndCompletionHandler + 3372
51 AppKit 0x1a0325a0c __84-[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:]_block_invoke_3.1020 + 148
52 AppKit 0x1a03256bc __204-[NSTextInputContext tryTSMProcessRawKeyEvent_orSubstitution:dispatchCondition:setupForDispatch:furtherCondition:doubleSpaceSubstitutionCondition:doubleSpaceSubstitutionWork:dispatchTSMWork:continuation:]_block_invoke.971 + 192
53 AppKit 0x19fb542e0 -[NSTextInputContext tryTSMProcessRawKeyEvent_orSubstitution:dispatchCondition:setupForDispatch:furtherCondition:doubleSpaceSubstitutionCondition:doubleSpaceSubstitutionWork:dispatchTSMWork:continuation:] + 344
54 AppKit 0x19fb53be0 -[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:] + 1528
55 AppKit 0x19fb535a8 -[NSTextInputContext _handleEvent:allowingSyntheticEvent:] + 136
56 AppKit 0x19fb533c8 -[NSView interpretKeyEvents:] + 196
57 AppKit 0x19fb531d8 -[NSTextView keyDown:] + 712
58 MDTextKitUI 0x104aa71c8 0x104a80000 + 160200
59 MDTextKitUI 0x104aa7244 0x104a80000 + 160324
60 AppKit 0x19fabaa78 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 5920
61 AppKit 0x19fab90ec -[NSWindow(NSEventRouting) sendEvent:] + 348
62 AppKit 0x19fab8558 -[NSApplication(NSEvent) sendEvent:] + 4064
63 AppKit 0x19fd7059c -[NSApplication _handleEvent:] + 76
64 AppKit 0x19f9395cc -[NSApplication run] + 636
65 AppKit 0x19f90ac78 NSApplicationMain + 1064
66 Panda 0x10480fedc 0x104808000 + 32476
67 dyld 0x104c650f4 start + 520