diff --git a/src/Error/UnknownNodeError.ts b/src/Error/UnknownNodeError.ts
index 03a062db5..8fbd7481b 100644
--- a/src/Error/UnknownNodeError.ts
+++ b/src/Error/UnknownNodeError.ts
@@ -3,7 +3,11 @@ import { BaseError } from "./BaseError";
 
 export class UnknownNodeError extends BaseError {
     public constructor(private node: ts.Node, private reference?: ts.Node) {
-        super(`Unknown node "${node.getFullText()}" of kind "${ts.SyntaxKind[node.kind]}"`);
+        super(
+            `Unknown node "${node.getSourceFile() ? node.getFullText() : "<unknown>"}" of kind "${
+                ts.SyntaxKind[node.kind]
+            }"`
+        );
     }
 
     public getNode(): ts.Node {