Elusive "Operation is not allowed in this context" Error

[Comintern]

I keep getting an error 3219, "Operation is not allowed in this context." in my error log that originates from the function below. Everywhere I look online, the only references to this error are for ADO, but there are no ADO objects acted on in the function. I also have no luck when I try to replicate the error (it only shows up about once every 200 or so runs). I'm pretty sure that it isn't originating in any of the called functions, because they have their own error handlers. Any ideas? Can Word throw this error for some reason?

Public Function CreateNotReins() As Boolean

    Dim sToOpen As String, sDeceased As String, sDate As String, sPolicy As String
    Dim sFace As String, sCeded As String
    
    On Error GoTo ErrorHand
    
    bOutputGo = False

    With frmDeathClaim
        sDeceased = Trim$(.txtFirstName.Text) & " " & Trim$(.txtLastName.Text)
        sDate = .txtDOD.Text
        If sDate = "NA" Then
            sDate = "Not Available"
        End If
        sPolicy = .txtPolicyNum.Text
        sFace = Format(.txtFace.Text, "$ #,###")
        sCeded = "$ 0"
    End With
    
    sToOpen = gsPath & "\DeathClaim.tpl"
    
    If oWord Is Nothing Then
        Set oWord = New Word.Application
    End If
    
    Set oTemplate = oWord.Documents.Open(sToOpen)
    
    With oTemplate
        .Bookmarks("Name").Range.Text = sDeceased
        .Bookmarks("Date").Range.Text = sDate
        .Bookmarks("Number").Range.Text = sPolicy
        .Bookmarks("Face").Range.Text = sFace
        .Bookmarks("Ceded").Range.Text = sCeded
        .Bookmarks("NotReins").Range.Text = "Policy is not reinsured."
    End With
    
    frmOutputOpts.Show (vbModal)
    frmDeathClaim.Repaint
    
    If bOutputGo = True Then
        If PostProcess = True Then
            CreateNotReins = True
        End If
    End If

ErrorHand:
    If Err.Number <> 0 Then
        sError = "Error number " & CStr(Err.Number) & "," & vbCrLf & Err.Description & "," & vbCrLf & _
                 "has occured in the CreateNotReins procedure."
        Call ErrorLogger(Err.Number, Err.Description, "CreateNotReins", "sPolicy = " & sPolicy)
        Err.Clear
        Call MsgBox(sError, vbCritical + vbOKOnly, "Critical Error")
    End If

End Function