diff --git a/src/services/refactors/extractSymbol.ts b/src/services/refactors/extractSymbol.ts
index 5b0032e6f01..0120f81cb02 100644
--- a/src/services/refactors/extractSymbol.ts
+++ b/src/services/refactors/extractSymbol.ts
@@ -486,8 +486,8 @@ namespace ts.refactor.extractSymbol {
                         // but a super *method call* simply implies a 'this' reference
                         if (node.parent.kind === SyntaxKind.CallExpression) {
                             // Super constructor call
-                            const containingClass = getContainingClass(node)!; // TODO:GH#18217
-                            if (containingClass.pos < span.start || containingClass.end >= (span.start + span.length)) {
+                            const containingClass = getContainingClass(node);
+                            if (containingClass === undefined || containingClass.pos < span.start || containingClass.end >= (span.start + span.length)) {
                                 (errors ||= []).push(createDiagnosticForNode(node, Messages.cannotExtractSuper));
                                 return true;
                             }
diff --git a/tests/cases/fourslash/extractSuperOutsideClass.ts b/tests/cases/fourslash/extractSuperOutsideClass.ts
new file mode 100644
index 00000000000..26fd2becd6a
--- /dev/null
+++ b/tests/cases/fourslash/extractSuperOutsideClass.ts
@@ -0,0 +1,6 @@
+/// <reference path='fourslash.ts' />
+
+/////*a*/super()/*b*/
+
+goTo.select("a", "b");
+verify.not.refactorAvailable("Extract Symbol");