diff --git a/src/AST/Type.cs b/src/AST/Type.cs
index 831b9f677..d686f5d9a 100644
--- a/src/AST/Type.cs
+++ b/src/AST/Type.cs
@@ -30,7 +30,7 @@ public abstract T Visit<T>(ITypeVisitor<T> visitor, TypeQualifiers quals
 
         public override string ToString()
         {
-            return TypePrinterDelegate(this);
+            return TypePrinterDelegate == null ? base.ToString() : TypePrinterDelegate(this);
         }
 
         public abstract object Clone();