diff --git a/lib/compress.js b/lib/compress.js
index 5cf2a2e6..bf2d895d 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6275,7 +6275,7 @@ Compressor.prototype.compress = function(node) {
 
     // tell me if a statement aborts
     function aborts(thing) {
-        return thing && thing.aborts();
+        return thing && thing.aborts && thing.aborts();
     }
     (function(def) {
         def(AST_Statement, return_null);