Fixing MS Access “Run Time Error 94 Invalid Use Of Null”– 5 Easy Ways!

Facing run-time errors in the meanwhile handling the Access database can be distressing, especially when dealing with complex VBA code structures. The run time error 94 invalid use of null Access is one such message that often perplexes users. It typically occurs due to missing value in a field, partial installation, or corrupt download of the Microsoft Access software, etc.

run time error 94 invalid use of null

Well, if you are also getting this error, then don’t fret. In this article, we will delve into the intricacies of Access error code 94, exploring its causes, and most importantly, how to troubleshoot it. So, without any further ado, let’s get started…

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Table of Contents:

What Does Run-Time Error ‘94’: Invalid Use of Null Mean?

Can Access Runtime Error 94 Lead to Potential Data Loss?

How to Fix Microsoft Access Error Code 94: Invalid Use of Null?

What Does Run-Time Error ‘94’: Invalid Use of Null Mean?

When this runtime error occurs then it simply means that there’s a blank field in the Access database or it’s in an incorrect format. On the other hand, we can say that when you try to use a Null value to perform a certain operation that isn’t allowed by the context of your VBA code then it can show this error. Null represents the missing value.

However, this runtime error is triggered due to various reasons. below I have specified the major ones:

  1. Conflicting the programs
  2. Access database corruption
  3. Due to missing value in a field
  4. Partial installation of an Access program.

Can Access Runtime Error 94 Invalid Use of Null Lead to Potential Data Loss?

Yes, Access VBA runtime error 94 can lead to potential data loss. Therefore, it is necessary to solve it promptly to avoid further data integrity or corruption issues. However, before addressing this error by implementing the solutions mentioned in the next section, it’s recommended to back up your database to avoid a data loss scenario.

How to Fix Microsoft Access Run Time Error 94 Invalid Use Of Null?

Follow the below step-by-step methods to troubleshoot this error:

Fix 1- Close the Conflicting Programs

In most of the cases, it has been seen that run-time errors in Access occur due to programs conflicting with each other.

So, if you suspect that the runtime error 94 has occurred because of conflicting programs, simply stop them.

For this, follow the below steps:

  • On your Windows desktop, click Ctrl + Alt + Del keys >> click on Task Manager.
  • Now, you will get the list of programs that are currently running in the background.
  • After this, go to a Processes tab & stop each program, and then click the End Process button.

Microsoft Access Error Code 94

  • After completing these steps, you have to check for the error. If the issue still persists then follow the next solutions.

Fix 2- Run VBA Code Using NZ Function to Fix Microsoft Access Error Code 94

Since you are experiencing the “invalid use of null” error message in Access so, it is recommended to run VBA using the NZ function. The NZ is a very useful function for trapping the errors triggered by NULL or missing values.

All you need to do is to consider running this streamlined VBA code by using the NZ function:

Dim U As String

U = NZ(Me.txtUnlock,0)

Dim fail as Boolean

If Not IsNumeric(U) Then

    MsgBox “Unlock pin only accepts numbers only.”, , “Retail unlock”

    fail = true

ElseIf Len(U) <> 4 Then

    MsgBox “Retail unlock must be four digits long.”, , “Retail unlock”

    fail = true

End If

If fail then

    With Me.txtUnlock

        .value = vbNullString


    End With

End If

And you are done!

This will eventually help you to solve your problem.

Fix 3- Repair Database Using Compact and Repair Utility

As already mentioned above, corruption in the Access database is the foremost reason for the occurrence of the MS Access VBA run time error 94 invalid use of null.

In such a case, running the MS Access Compact & Repair tool can come in handy. But before using this Access built-in tool, it is essential to remember the following things:

How to Compact and Repair Database:

  • Open the Microsoft Access program.
  • Next, double-tap on a Blank desktop database.

Blank Database

  • Go to the File >> click on Close.
  • Now, on the Blank Database >> go to a File
  • In the Database Tools, you have to click on “Compact and Repair Database”.

Microsoft Access Error Code 94

  • Then, choose the Access database throwing a runtime error 94 & which you wish to compact & repair. Click Compact.

Finally, you will get a copy of the repaired database saved in the location where your actual file is stored.

Fix 4: Execute Windows Clean Installation

run time error 94 invalid use of null

Many users have reported that they fixed invalid use of null by reinstalling the Windows operating system. therefore, you should also try to reinstall Windows OS.

This will erase everything from your hard drive and allow your system to start fresh.

Fix 5: Use Advanced Access Repair Tool

Even after following the above methods, if the error persists, you should opt for MS Access Repair and Recovery Tool. This program will eventually help you to repair the corrupt Access database and solve run time error 94 successfully.

Although it can fix corruption in .mdb or .acccdb files & recover data from the corrupted Access database.

Not only this, it also restores the indexes, relations, tables, queries, and other stuff in a few simple clicks.

Key Features of Access Repair & Recovery:

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  • Compatible with Access 2010, 2013, 2016, 2019& later versions.
  • User-friendly
  • 100% trusted & easy to use.

* By clicking the Download button above and installing Stellar Repair for Access (14.8 MB), I acknowledge that I have read and agree to the End User License Agreement and Privacy Policy of this site.

So, just download & install this program on your PC & follow the below steps to learn how it works:

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How to Prevent Runtime Error 94 Invalid Use of Null Windows 10/11?

To prevent the Access error “Invalid use of Null“, it’s vital to implement good practices. You should always create a backup of your crucial Excel file to avoid severe data loss. Besides, always verify for Null values before you use them in calculations. There is a tool available in Microsoft Excel to handle nulls that is Nz() function.

In simple words, Nz() function is used to handle the null (empty) values in Access calculations or expressions.

Related FAQs:

What Is The Use Of Is Null In Access?

The IsNull() function in Access helps to check whether an expression contains Null (no data).

How Can I Identify The Source Of Runtime Error 94 In My Access Database?

To detect the root of runtime error 94 in Access, check the query or VBA code carefully that is causing the problem. Verify for instances where you’re using the data that might be Null without proper validation.

How Do I Fix Runtime Error 94?

You can fix runtime error 94 by trying the below methods:

  • Restart your PC
  • Examine the VBA code
  • Close the conflicting programs
  • Repair the database corruption.

Are There Automated Tools to Detect Such Errors?

Yes, there are various tools debugging and automated tools are available to automatically detect & highlight the potential run-time errors.

Verdict Time

Addressing the VBA runtime errors including error code 94 in Access requires a combination of understanding the error, applying the effective troubleshooting steps, and implementing the precautionary measures. By following the solutions mentioned in this blog, you can solve this error and maintain smooth operations.

Apart from that, if any of you’ve more solutions to troubleshoot this specific error code, you can comment on our Facebook or Twitter accounts.


tip Still having issues? Fix them with this Access repair tool:

This software repairs & restores all ACCDB/MDB objects including tables, reports, queries, records, forms, and indexes along with modules, macros, and other stuffs effectively.

  1. Download Stellar Repair for Access rated Great on Cnet (download starts on this page).
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Pearson Willey is a website content writer and long-form content planner. Besides this, he is also an avid reader. Thus he knows very well how to write an engaging content for readers. Writing is like a growing edge for him. He loves exploring his knowledge on MS Access & sharing tech blogs.