diff --git a/src/index/referenceindexer.ts b/src/index/referenceindexer.ts
index ded7a23..7111dce 100644
--- a/src/index/referenceindexer.ts
+++ b/src/index/referenceindexer.ts
@@ -634,8 +634,8 @@ export class ReferenceIndexer {
         const file = ts.createSourceFile(fileName, data, ts.ScriptTarget.Latest);
 
         file.statements.forEach((node: ts.Node) => {
-            if (ts.isImportDeclaration(node)) {
-                if (ts.isStringLiteral(node.moduleSpecifier)) {
+            if (ts.isImportDeclaration(node) || ts.isExportDeclaration(node)) {
+                if (node.moduleSpecifier && ts.isStringLiteral(node.moduleSpecifier)) {
                     result.push({
                         specifier: node.moduleSpecifier.text,
                         location: {