Description
When there are multiple errors in the debug tab and the tab is inactive (eg: when starting from the Preview tab), it can error (less than 20% of the time):

Reproduction Steps
Go to https://wsdemos.uc.r.appspot.com/homewarrior#development=1 and click the Debug tab. Try that many times until it gets triggered.
Logs
AssertionError: Assertion failed: WebAssembly is uninitialized
at new goog.asserts.AssertionError (https://cdn.ampproject.org/v0/validator_wasm.js:95:1390)
at Object.goog.asserts.doAssertFailure_ (https://cdn.ampproject.org/v0/validator_wasm.js:96:264)
at Object.goog.asserts.assertExists (https://cdn.ampproject.org/v0/validator_wasm.js:97:254)
at Object.module$contents$amp$validator_validateString [as validateString] (https://cdn.ampproject.org/v0/validator_wasm.js:962:86)
at https://cdn.ampproject.org/rtv/042105242203000/v0/amp-story-dev-tools-0.1.js:15:257