1 files changed, 1 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 8df6bbd5..bb355423 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3982,7 +3982,7 @@ merge(Compressor.prototype, {
             do {
                 scope = compressor.parent(++level);
                 if (scope instanceof AST_SymbolRef) {
-                    scope = scope.fixed_value();
+                    if (scope.fixed_value() instanceof AST_Scope) return false;
                 } else if (scope instanceof AST_Catch) {
                     catches[scope.argname.name] = true;
                 }