diff --git a/tests/helper/test-case.js b/tests/helper/test-case.js
index 0883d26baf..6af06451fb 100644
--- a/tests/helper/test-case.js
+++ b/tests/helper/test-case.js
@@ -183,7 +183,12 @@ class TokenizeJSONRunner {
 	 */
 	isEqual(actual, expected) {
 		const simplifiedActual = TokenStreamTransformer.simplify(actual);
-		const simplifiedExpected = JSON.parse(expected);
+		let simplifiedExpected;
+		try {
+			simplifiedExpected = JSON.parse(expected);
+		} catch (error) {
+			return false;
+		}
 
 		return JSON.stringify(simplifiedActual) === JSON.stringify(simplifiedExpected);
 	}
@@ -197,7 +202,6 @@ class TokenizeJSONRunner {
 		const simplifiedActual = TokenStreamTransformer.simplify(actual);
 		const simplifiedExpected = JSON.parse(expected);
 
-
 		const actualString = JSON.stringify(simplifiedActual);
 		const expectedString = JSON.stringify(simplifiedExpected);