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Access violation at address 000000000433A042 in module 'Toad.exe'. Read of address FFFFFFFFFFFFFFFF

I'm running Toad 13.3.0.181
I was getting this exception every time I tried to get focus on the edit window. Seems to be isolated to that connection as edit windows in other connections were not affected.

Exception:
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  2.1 Date          : Mon, 28 Sep 2020 10:05:50 -0600
  2.2 Address       : 000000000433A042
  2.3 Module Name   : Toad.exe - (Toad® for Oracle)
  2.4 Module Version: 13.3.0.181
  2.5 Type          : EAccessViolation
  2.6 Message       : Access violation at address 000000000433A042 in module 'Toad.exe'. Read of address FFFFFFFFFFFFFFFF.
  2.7 ID            : 7410FA4B
  2.8 Count         : 1
  2.11 Sent         : 0


Active Controls:
------------------------------------------------------------------------------------------------
  4.1 Form Class   : TfrmMain
  4.2 Form Text    : Toad for Oracle - [CAPS@DEV-I (racmbdev_1:rac-mbdevi-1) - Editor (New 1 *)]
  4.3 Control Class: TtdDScintilla
  4.4 Control Text : 

Steps to reproduce:
------------
  8.1 Text: 


Call Stack Information:
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|Methods |Details|Stack           |Address         |Module      |Offset          |Source             |Unit           |Class            |Procedure/Method                 |Line                             |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|*Exception Thread: ID=13680; Parent=0; Priority=-2                                                                                                                                                        |
|Class=; Name=MAIN                                                                                                                                                                                         |
|DeadLock=0; Wait Chain=                                                                                                                                                                                   |
|Comment=                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|7FFFFFFE|03     |0000000000000000|000000000433A042|Toad.exe    |00000000001AA042|System.Classes.pas |System.Classes |TComponent       |RemoveNotification               |                                 |
|00000040|03     |00000000007FF548|000000000433A0F2|Toad.exe    |00000000001AA0F2|System.Classes.pas |System.Classes |TComponent       |RemoveFreeNotification           |                                 |
|00000040|04     |00000000007FF588|000000000947F307|Toad.exe    |00000000052EF307|frmSyntaxEditor.pas|frmSyntaxEditor|TSyntaxEditorForm|SetSelectedMessage               |8419[2]                          |
|00000040|04     |00000000007FF5D8|0000000009470A30|Toad.exe    |00000000052E0A30|frmSyntaxEditor.pas|frmSyntaxEditor|TSyntaxEditorForm|MemoMouseDown                    |4080[1]                          |
|00000040|03     |00000000007FF608|0000000004553845|Toad.exe    |00000000003C3845|Vcl.Controls.pas   |Vcl.Controls   |TControl         |MouseDown                        |                                 |
|00000040|03     |00000000007FF648|000000000455394C|Toad.exe    |00000000003C394C|Vcl.Controls.pas   |Vcl.Controls   |TControl         |DoMouseDown                      |                                 |
|00000040|03     |00000000007FF6C8|00000000045539C5|Toad.exe    |00000000003C39C5|Vcl.Controls.pas   |Vcl.Controls   |TControl         |WMLButtonDown                    |                                 |
|00000040|03     |00000000007FF708|00000000041A121E|Toad.exe    |000000000001121E|System.pas         |System         |TObject          |Dispatch                         |                                 |
|00000040|03     |00000000007FF758|0000000004553083|Toad.exe    |00000000003C3083|Vcl.Controls.pas   |Vcl.Controls   |TControl         |WndProc                          |                                 |
|00000040|03     |00000000007FF8C8|0000000004559F32|Toad.exe    |00000000003C9F32|Vcl.Controls.pas   |Vcl.Controls   |TWinControl      |WndProc                          |                                 |
|00000040|04     |00000000007FF998|0000000009EB6A78|Toad.exe    |0000000005D26A78|tdDScintilla.pas   |tdDScintilla   |TtdDScintilla    |WndProc                          |14073[124]                       |
|00000040|03     |00000000007FFAD8|000000000455917A|Toad.exe    |00000000003C917A|Vcl.Controls.pas   |Vcl.Controls   |TWinControl      |MainWndProc                      |                                 |
|00000040|03     |00000000007FFB28|000000000433D594|Toad.exe    |00000000001AD594|System.Classes.pas |System.Classes |                 |StdWndProc                       |                                 |
|00000040|03     |00000000007FFB78|00007FF9EB367530|user32.dll  |0000000000017530|user32.dll         |user32         |                 | (possible DispatchMessageW+1696)|                                 |
|00000040|03     |00000000007FFCF8|00007FF9EB36704D|user32.dll  |000000000001704D|user32.dll         |user32         |                 | (possible DispatchMessageW+445) |                                 |
|00000040|03     |00000000007FFD78|000000000471391F|Toad.exe    |000000000058391F|Vcl.Forms.pas      |Vcl.Forms      |TApplication     |ProcessMessage                   |                                 |
|00000040|03     |00000000007FFDF8|0000000004713993|Toad.exe    |0000000000583993|Vcl.Forms.pas      |Vcl.Forms      |TApplication     |HandleMessage                    |                                 |
|00000040|03     |00000000007FFE68|0000000004713DFF|Toad.exe    |0000000000583DFF|Vcl.Forms.pas      |Vcl.Forms      |TApplication     |Run                              |                                 |
|00000040|04     |00000000007FFEA8|0000000009FBA5EE|Toad.exe    |0000000005E2A5EE|Toad.dpr           |Toad           |                 |Initialization                   |1952[122]                        |
|00000040|03     |00000000007FFF28|00007FF9ED68796E|kernel32.dll|000000000001796E|KERNEL32.DLL       |KERNEL32       |                 |BaseThreadInitThunk              |                                 |
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