1 files changed, 3 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 590015ff..8350ba25 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2922,7 +2922,9 @@ merge(Compressor.prototype, {
                 && (self.car.operator == "++" || self.car.operator == "--")) {
                 left = self.car.expression;
             }
-            if (left) {
+            if (left
+                && !(left instanceof AST_SymbolRef
+                    && left.definition().orig[0] instanceof AST_SymbolLambda)) {
                 var parent, field;
                 var cdr = self.cdr;
                 while (true) {