diff --git a/.eslintrc.json b/.eslintrc.json
index 49191e9..f6fc534 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -120,7 +120,7 @@
 		"no-throw-literal": "error",
 		"no-trailing-spaces": "error",
 		"no-undef-init": "error",
-		"no-undefined": "error",
+		"no-undefined": "off",
 		"no-underscore-dangle": "error",
 		"no-unmodified-loop-condition": "error",
 		"no-unneeded-ternary": "error",
diff --git a/src/script.js b/src/script.js
index 3d9349a..b9295ca 100644
--- a/src/script.js
+++ b/src/script.js
@@ -1007,7 +1007,7 @@ globalConsoleContainerEl, externalLibrarySearchInput, keyboardShortcutsModal
 				'"></script>';
 		}
 
-		if (js) {
+		if (js !== undefined) {
 			contents += '<script>\n' + js + '\n//# sourceURL=userscript.js';
 		} else {
 			var origin = chrome.i18n.getMessage()