Runtime error 5631 - excel

Question

I am trying to generate certificates using the records from my Excel master data file. My coding throws me a VBA error "Runtime error - 5631; Word could not merge the main document with the data source because the data records were empty or no data records matched your query options" every alternate time.
For some data, the code works, whereas for most of the time, it throws error 5631 in the line .Execute Pause:=False
There are records inside the file, so I know there is something wrong with my Query itself.
Other info:
Temp1 = Cookies mailmerge word template,
Temp2 = Chocolates mailmerge word template,
Temp3 = Drinks mailmerge word template
Sheet1 = Cookies sales excel data,
Sheet2 = Chocolates sales excel data,
Sheet3 = Drinks sales excel data
My complete code:
Sub Generate_Cert()
Dim wd As Object
Dim wdoc As Object
Dim i As Integer
Dim isInvalid As Boolean
Dim statement, fileSuffix, datasource As String
Dim aSheet As Worksheet
Dim cDir As String
Dim wdName As String
Const wdFormLetters = 0
Const wdOpenFormatAuto = 0
Const wdSendToNewDocument = 0
Const wdDefaultFirstRecord = 1
Const wdDefaultLastRecord = -16
SalesDate = Format(Worksheets("SalesMaster").Cells(2, "B").Value, "DDMMYYYY")
On Error Resume Next
'Check Word is open or not
Set wd = GetObject(, "Word.Application")
If wd Is Nothing Then
'If Not open, open Word Application
Set wd = CreateObject("Word.Application")
End If
On Error GoTo 0
'Getting datasource
datasource = ThisWorkbook.Path & "\" & ThisWorkbook.Name
'Looping all sheet from workbook
For Each aSheet In ThisWorkbook.Sheets
'If the first cell is not empty
If aSheet.Range("A2").Value <> "" Then
isInvalid = False
'Check sheet for SQLStatement and save file name.
Select Case aSheet.Name
Case "Sheet1"
statement = "SELECT * FROM `Sheet1$`"
fileSuffix = " Cookies Sales"
i = 1
Case "Sheet2"
statement = "SELECT * FROM `Sheet2$`"
fileSuffix = " Chocolates Sales"
i = 2
Case "Sheet3"
statement = "SELECT * FROM `Sheet3$`"
fileSuffix = " Drinks Sales"
i = 3
Case Else
isInvalid = True
End Select
'If sheet should save as word
If Not isInvalid Then
'Getting new word document
Set wdoc = wd.Documents.Open("C:\Desktop\Sales Certs\Temp" & i & ".docx")
With wdoc.MailMerge
.MainDocumentType = wdFormLetters
.OpenDataSource Name:=datasource, AddToRecentFiles:=False, _
Revert:=False, Format:=wdOpenFormatAuto, _
Connection:="Data Source=" & datasource & ";Mode=Read", _
SQLStatement:=statement
.Destination = wdSendToNewDocument
.SuppressBlankLines = True
With .datasource
.FirstRecord = wdDefaultFirstRecord
.LastRecord = wdDefaultLastRecord
End With
.Execute Pause:=False
End With
'wdoc.Visible = True
wdName = SalesDate & fileSuffix & ".docx"
cDir = ActiveWorkbook.Path + "\"
wd.ActiveDocument.SaveAs cDir + wdName
MsgBox SalesDate & fileSuffix & " has been generated and saved"
'wdoc.SaveAs Filename:=wdoc.Name
wdoc.Close SaveChanges:=True
End If
End If
Next aSheet
wd.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

Answer 1

This error was occurring because my source excel document was not saved before the Mailmerge execution. No need to save the word document, as there was no pre-processing necessary before the Mailmerge execution.
So I basically declared wBook as workbook & added this : wBook.Save
Sub Generate_Cert()
Dim wd As Object
Dim wdoc As Object
Dim i As Integer
Dim isInvalid As Boolean
Dim statement, fileSuffix, datasource As String
Dim wBook As Workbook
Dim aSheet As Worksheet
Dim cDir As String
Dim wdName As String
Const wdFormLetters = 0
Const wdOpenFormatAuto = 0
Const wdSendToNewDocument = 0
Const wdDefaultFirstRecord = 1
Const wdDefaultLastRecord = -16
wBook.save '<~~~~~~~ SAVE BEFORE MAILMERGE STARTS
SalesDate = Format(Worksheets("SalesMaster").Cells(2, "B").Value, "DDMMYYYY")
On Error Resume Next
'Check Word is open or not
Set wd = GetObject(, "Word.Application")
If wd Is Nothing Then
'If Not open, open Word Application
Set wd = CreateObject("Word.Application")
End If
On Error GoTo 0
'Getting datasource
datasource = ThisWorkbook.Path & "\" & ThisWorkbook.Name
'Looping all sheet from workbook
For Each aSheet In ThisWorkbook.Sheets
'If the first cell is not empty
If aSheet.Range("A2").Value <> "" Then
isInvalid = False
'Check sheet for SQLStatement and save file name.
Select Case aSheet.Name
Case "Sheet1"
statement = "SELECT * FROM `Sheet1$`"
fileSuffix = " Cookies Sales"
i = 1
Case "Sheet2"
statement = "SELECT * FROM `Sheet2$`"
fileSuffix = " Chocolates Sales"
i = 2
Case "Sheet3"
statement = "SELECT * FROM `Sheet3$`"
fileSuffix = " Drinks Sales"
i = 3
Case Else
isInvalid = True
End Select
'If sheet should save as word
If Not isInvalid Then
'Getting new word document
Set wdoc = wd.Documents.Open("C:\Desktop\Sales Certs\Temp" & i & ".docx")
With wdoc.MailMerge
.MainDocumentType = wdFormLetters
.OpenDataSource Name:=datasource, AddToRecentFiles:=False, _
Revert:=False, Format:=wdOpenFormatAuto, _
Connection:="Data Source=" & datasource & ";Mode=Read", _
SQLStatement:=statement
.Destination = wdSendToNewDocument
.SuppressBlankLines = True
With .datasource
.FirstRecord = wdDefaultFirstRecord
.LastRecord = wdDefaultLastRecord
End With
.Execute Pause:=False
End With
'wdoc.Visible = True
wdName = SalesDate & fileSuffix & ".docx"
cDir = ActiveWorkbook.Path + "\"
wd.ActiveDocument.SaveAs cDir + wdName
MsgBox SalesDate & fileSuffix & " has been generated and saved"
'wdoc.SaveAs Filename:=wdoc.Name
wdoc.Close SaveChanges:=True
End If
End If
Next aSheet
wd.Quit SaveChanges:=wdDoNotSaveChanges
End Sub