Coding⏱️ 2 min read📅 2026-06-04

How to Fix: Typescript, how to pass "Object is possibly null" error?

In TypeScript, use the optional chaining operator (?.) or nullish coalescing operator (??) to safely access nested properties without encountering the 'Object is possibly null' error.

Quick Answer: Replace `overlayEl.current` with `overlayEl?.current` or `overlayEl?.current || []` to avoid the error.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

The 'Object is possibly null' error in TypeScript occurs when the compiler is unable to guarantee that an object will not be null or undefined at runtime.

This error affects developers who use objects and arrays in their code, particularly those using functional programming concepts.

⚠️ Common Causes

  • The primary cause of this error is the use of the 'any' type in TypeScript, which allows for unknown or unspecified types to be used in variable declarations.
  • Another cause is the incorrect use of optional chaining (?.) when accessing object properties. When using optional chaining, you must ensure that the property exists before attempting to access it.

🔧 Proven Troubleshooting Steps

Using the 'in' Operator

  1. Step 1: Check if the object has a specific property by using the 'in' operator.
  2. Step 2: Use the nullish coalescing operator (??) to provide a default value if the property does not exist.
  3. Step 3: Example: `const overlayEl = useRef(null); if ('current' in overlayEl) { overlayEl.current.focus(); }`

Using Optional Chaining

  1. Step 1: Use optional chaining (?.) to access object properties safely.
  2. Step 2: Example: `const overlayEl = useRef(null); if (overlayEl?.current) { overlayEl.current.focus(); }`

✨ Wrapping Up

To resolve the 'Object is possibly null' error, use either the 'in' operator or optional chaining to ensure that objects are not null before attempting to access their properties. By following these steps, you can safely write code that handles possible null values.

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