Don't try to demangle call stack on browsers where the feature is not supported.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/preamble.js b/src/preamble.js
index aedb0e7c..ee273f6a 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -774,7 +774,8 @@ function demangleAll(text) {
 }
 
 function stackTrace() {
-  return demangleAll(new Error().stack);
+  var stack = new Error().stack;
+  return stack ? demangleAll(stack) : '(no stack trace available)'; // Stack trace is not available at least on IE10 and Safari 6.
 }
 
 // Memory management