diff --git a/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/non-typeof/actual.js b/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/non-typeof/actual.js
new file mode 100644
index 0000000000..b637888826
--- /dev/null
+++ b/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/non-typeof/actual.js
@@ -0,0 +1,5 @@
+export default function (number) {
+    if (!isNaN(number)) {
+        return 1;
+    }
+}
diff --git a/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/non-typeof/expected.js b/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/non-typeof/expected.js
new file mode 100644
index 0000000000..b637888826
--- /dev/null
+++ b/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/non-typeof/expected.js
@@ -0,0 +1,5 @@
+export default function (number) {
+    if (!isNaN(number)) {
+        return 1;
+    }
+}
diff --git a/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/options.json b/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/options.json
new file mode 100644
index 0000000000..a9b95ca6a3
--- /dev/null
+++ b/packages/babel-core/test/fixtures/transformation/transform-es2015-typeof-symbol/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-es2015-typeof-symbol"]
+}
diff --git a/packages/babel-plugin-transform-es2015-typeof-symbol/src/index.js b/packages/babel-plugin-transform-es2015-typeof-symbol/src/index.js
index a3da0e6267..08df2600a8 100644
--- a/packages/babel-plugin-transform-es2015-typeof-symbol/src/index.js
+++ b/packages/babel-plugin-transform-es2015-typeof-symbol/src/index.js
@@ -6,7 +6,7 @@ export default function ({ types: t }) {
       UnaryExpression(path) {
         let { node, parent } = path;
         if (node[IGNORE]) return;
-        if (path.find(path => !!path.node._generated)) return;
+        if (path.find(path => path.node && !!path.node._generated)) return;
 
         if (path.parentPath.isBinaryExpression() && t.EQUALITY_BINARY_OPERATORS.indexOf(parent.operator) >= 0) {
           // optimise `typeof foo === "string"` since we can determine that they'll never need to handle symbols