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TypeError: Cannot read properties of undefined (reading 'evaluate')This error typically happens in three contexts: XPath parsing (document.evaluate), templating engines where a context object is missing, or scripted RPG tools (like Perchance). It means the engine is trying to execute code ('evaluate') on an object that hasn't been initialized.
Add a check at the start of your script to ensure the engine or context exists.
// Check if templating data exists before evaluating
if (typeof engine === 'undefined' || !engine.data) {
return "Loading...";
}
return engine.evaluate('my_variable');Ensure the document is valid before running DOM XPath methods.
const doc = xmlResponse.responseXML;
const result = doc?.evaluate?.('//title', doc) ?? null;