UiPath-ADPv1 Advanced Debugging Practice Question
Exhibit
Error: 'Object reference not set to an instance of an object.' at Assign activity. Variable: 'ConfigDict'.
Refer to the exhibit. You are debugging a NullReferenceException in a project that uses a 'ConfigDict'. What is the most likely culprit, and how should you verify it?
⚠ Common exam trap
Candidates confuse the Watch panel with the Immediate panel, or incorrectly assume that uninitialized dictionaries throw compilation errors rather than runtime NullReferenceExceptions.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ConfigDict variable is missing a default value; verify by typing 'ConfigDict is Nothing' in the Immediate Panel.
A NullReferenceException indicates that a variable is uninitialized or null when accessed. In UiPath, this often happens if the dictionary was declared but not instantiated using the 'New Dictionary(Of String, Object)' constructor. Checking the variable's value in the Immediate Panel during a breakpoint is the fastest way to confirm if it is null, allowing you to fix the initialization logic in the variable panel or setup block.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The ConfigDict variable is missing a default value; verify by typing 'ConfigDict is Nothing' in the Immediate Panel.
Why this is correct
Testing for 'Nothing' is the standard way to confirm if a variable is null. If the Immediate Panel returns 'True', you have confirmed the dictionary was not initialized. This allows you to immediately identify that the constructor was missing during the instantiation of the dictionary object variable.
- ✗
The dictionary key does not exist; verify by checking the Orchestrator assets.
Why it's wrong here
Accessing a missing key in a dictionary usually throws a 'KeyNotFoundException', not a 'NullReferenceException'. This distinction is important; the latter implies the entire dictionary object is null, while the former implies the object exists but lacks the requested key. Your focus should be on instantiation.
- ✗
The variable scope is too small; verify by checking the 'Variables' pane filters.
Why it's wrong here
If a variable scope is too small, the workflow would fail during compilation, preventing the process from running at all. A runtime NullReferenceException means the code compiled, but the object was null at the point of execution, which is an initialization problem, not a scope issue.
- ✗
The dictionary contains objects of the wrong type; verify by using the 'Type Into' activity.
Why it's wrong here
The 'Type Into' activity interacts with UI elements and has no bearing on verifying data types inside a dictionary. Checking types should be done through inspection tools like the Locals panel or by printing the type using a log message, not by interacting with the UI.
About these practice questions
This UiPath-ADPv1 question is part of Courseiva's 276-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official UiPath exam blueprint
This UiPath-ADPv1 practice question is part of Courseiva's free UiPath certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the UiPath-ADPv1 exam.