How to Quickly Fix VBA Runtime Error 91 (Step-by-Step) (Excel)
Written by Kasper Langmann
VBA Runtime Error 91, also known as ‘Object Variable or With Block Variable Not Set’, is a common issue that Excel users encounter. This error typically arises when you’re trying to use a variable that hasn’t been set yet. While it may seem daunting at first, it’s actually quite simple to fix. In this guide, we’ll walk you through the process step-by-step.
Understanding VBA Runtime Error 91
Before we delve into the solution, it’s important to understand what VBA Runtime Error 91 is. VBA, or Visual Basic for Applications, is a programming language developed by Microsoft. It’s used primarily for automating tasks in Microsoft Office applications.
Runtime Error 91 is a specific type of error that occurs when you try to call an object variable that hasn’t been set yet. In other words, you’re trying to use a variable before it’s been given a value. This can happen for a variety of reasons, such as if you’ve misspelled the variable name or if you’re trying to call a variable from a different subroutine.
Common Causes of VBA Runtime Error 91
There are several reasons why you might encounter VBA Runtime Error 91. Here are some of the most common causes:
Using a variable that hasn’t been set: This is the most common cause of Runtime Error 91. If you try to use a variable before it’s been set, you’ll encounter this error.
Misspelling a variable name: If you misspell the name of a variable, VBA won’t be able to find it, and you’ll get Runtime Error 91.
Calling a variable from a different subroutine: Variables in VBA are local by default, which means they can only be used in the subroutine where they were declared. If you try to use a variable from a different subroutine, you’ll get Runtime Error 91.
How to Fix VBA Runtime Error 91
Now that we understand what VBA Runtime Error 91 is and what causes it, let’s look at how to fix it. Here are the steps:
Identify the problematic variable: The first step in fixing Runtime Error 91 is to identify the variable that’s causing the problem. Look at the error message to see which variable is mentioned.
Check if the variable has been set: Once you’ve identified the problematic variable, check to see if it’s been set. If it hasn’t, you’ll need to set it before you can use it.
Correct any misspellings: If the variable has been set, check to see if you’ve misspelled its name anywhere. If you have, correct the spelling.
Ensure the variable is being called from the correct subroutine: If the variable has been set and spelled correctly, check to see if you’re trying to call it from a different subroutine. If you are, you’ll need to either make the variable global or move the call to the correct subroutine.
Preventing VBA Runtime Error 91
While it’s important to know how to fix VBA Runtime Error 91, it’s even better to prevent it from happening in the first place. Here are some tips to help you avoid this error:
Always set your variables before you use them: This is the most effective way to prevent Runtime Error 91. Make sure to set your variables before you try to use them.
Use descriptive variable names: Using descriptive variable names can help you avoid misspellings and make your code easier to read and debug.
Keep your subroutines small and focused: By keeping your subroutines small and focused, you can reduce the likelihood of trying to use a variable from a different subroutine.
By following these tips, you can reduce the likelihood of encountering VBA Runtime Error 91 and make your VBA programming experience much smoother.
VBA Runtime Error 91 can be a frustrating issue to encounter, but with a little knowledge and some careful coding, it’s easy to fix. By understanding what causes this error and how to prevent it, you can save yourself a lot of time and frustration. Happy coding!