diff --git a/packages/chameleon-linter/checkers/script.js b/packages/chameleon-linter/checkers/script.js
index f265f23f127743c8cdae22304a3785cc6272e54a..ad9b8b5ad8e9961043e67ecc0dd39efcbe443ef9 100644
--- a/packages/chameleon-linter/checkers/script.js
+++ b/packages/chameleon-linter/checkers/script.js
@@ -93,7 +93,7 @@ function getCompClassDef(ast) {
               };
             } else if (nameArg.isIdentifier()) {
               let argBinding = nameArg.scope.getBinding(nameArg.node.name);
-              let possibleInit = argBinding.path.node.init;
+              let possibleInit = argBinding ? argBinding.path.node.init : null;
               // For now, we only check just one jump along its scope chain.
               if (possibleInit && possibleInit.type === 'StringLiteral') {
                 event = {
diff --git a/packages/cml-js-parser/src/visitors/containerPathVisitor.js b/packages/cml-js-parser/src/visitors/containerPathVisitor.js
index c99594c294c1172ac1c3c427118d058373001cb8..999528bd740be0d3134cbc60008272419fbfb66a 100644
--- a/packages/cml-js-parser/src/visitors/containerPathVisitor.js
+++ b/packages/cml-js-parser/src/visitors/containerPathVisitor.js
@@ -159,7 +159,7 @@ module.exports.containerPathVisitor = function(path) {
               });
             } else if (nameArg.isIdentifier()) {
               let argBinding = nameArg.scope.getBinding(nameArg.node.name);
-              let possibleInit = argBinding.path.node.init;
+              let possibleInit = argBinding ? argBinding.path.node.init : null;
               // For now, we only check just one jump along its scope chain.
               if (possibleInit && possibleInit.type === 'StringLiteral') {
                 results.events.push({