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JavaScript tried to read properties from null or undefined

TypeError: null/undefined has no properties

JavaScript attempted property access on a value that is null or undefined.

TypeError: null/undefined has no propertiesruntime

Observed message

TypeError: null/undefined has no properties

Why it happens

  • A value is null or undefined at the point of property access.
  • Async data or API responses were assumed to exist when they do not.
  • A chain of object access lacks guards for missing intermediate values.

How to fix it

  1. Check where the nullish value originates before the failing access.
  2. Use optional chaining or guards where missing values are expected.
  3. Validate external data and defaults before reading nested properties.

Official reference

MDN: TypeError: null/undefined has no properties

Related errors

ReferenceError: can't access lexical declaration before initializationJavaScript accessed a let or const binding before initializationReferenceError: assignment to undeclared variableJavaScript assigned to an undeclared variableTypeError: class constructors must be invoked with 'new'JavaScript class constructor was called without newRangeError: x can't be converted to BigInt because it isn't an integerJavaScript could not convert a non-integer value to BigInt

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JavaScript null or undefined has no properties | Error Atlas