[Access] Run-time error '3144': - Syntax error in UPDATE statement

[hydrakiller4000]

Hello, everyone! I'm running an update query programmatically, and I'm receiving a syntax error for some reason. I can't seem to figure out what's wrong. Here's my code:

Dim db As Database
            
Set db = CurrentDb()

db.Execute "UPDATE tblBins SET datRepairDate = null, datClaimDate = null, " & _
            "txtRepairTech = " & vbNullString & ", txtTypeandSerial = " & vbNullString & ", " & _
            "txtAsset = " & vbNullString & ", " & _
            "txtPart1andFRU = " & vbNullString & ", txtPart2andFRU = " & vbNullString & ", " & _
            "txtPart3andFRU = " & vbNullString & ", txtPart4andFRU = " & vbNullString & ", " & _
            "txtPart5andFRU = " & vbNullString & ", memoProblemandTroubleshooting = " & vbNullString & ", " & _
            "intHEAT = null, txtLenovoClaimID = " & vbNullString & ", txtStatus = " & vbNullString & ", " & _
            "txtTrackingNumber1 = " & vbNullString & ", txtShortClaimNumber1 = " & vbNullString & ", " & _
            "txtTrackingNumber2 = " & vbNullString & ", txtShortClaimNumber2 = " & vbNullString & ", " & _
            "txtTrackingNumber3 = " & vbNullString & ", txtShortClaimNumber3 = " & vbNullString & ", " & _
            "txtTrackingNumber4 = " & vbNullString & ", txtShortClaimNumber4 = " & vbNullString & ", " & _
            "txtTrackingNumber5 = " & vbNullString & ", txtShortClaimNumber5 = " & vbNullString & ", " & _
            "boolComplete = False " & _
            "WHERE ((([tblBins].binID)='" & Me.binID & "'));"

Everything is a String except for intHEAT, datRepairDate, datClaimDate, and boolComplete. Those variables are of the data types Integer, Date, Date, and Boolean, respectively.

I've tried a lot of solutions and suggestions online, but I'm not sure what the syntax error is. Does anyone have any suggestions? Thanks in advance for any help!