Web Reference: Jan 24, 2020 · I have a project uses Express and react, Everything was working fine, I didn't make any changes to the code suddenly it starts to give this error. In the previous days, I have upgraded node from... Nov 29, 2025 · React components render immediately, and if your initial state is undefined or you're accessing nested properties before data loads, the error occurs. Always initialize state with appropriate default values like null, empty arrays, or objects with required structure. This error happens when you attempt to use a variable or object that hasn't been properly initialized or doesn't exist. Undefined means that a variable has been declared but has not been assigned a value, or you're trying to access a property that doesn't exist on an object. In JavaScript, properties and functions can only belong to objects. Since ...
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