diff --git a/src/debug/debug.cc b/src/debug/debug.cc
index 656472683060..cb1f34f390e5 100644
--- a/src/debug/debug.cc
+++ b/src/debug/debug.cc
@@ -1777,6 +1777,11 @@ void Debug::OnPromiseReject(Handle<Object> promise, Handle<Object> value) {
 
 
 void Debug::OnException(Handle<Object> exception, Handle<Object> promise) {
+  // We cannot generate debug events when JS execution is disallowed.
+  // TODO(5530): Reenable debug events within DisallowJSScopes once relevant
+  // code (MakeExceptionEvent and ProcessDebugEvent) have been moved to C++.
+  if (!AllowJavascriptExecution::IsAllowed(isolate_)) return;
+
   Isolate::CatchType catch_type = isolate_->PredictExceptionCatcher();
 
   // Don't notify listener of exceptions that are internal to a desugaring.
diff --git a/test/debugger/debug/regress/regress-662674.js b/test/debugger/debug/regress/regress-662674.js
new file mode 100644
index 000000000000..46054a5cd978
--- /dev/null
+++ b/test/debugger/debug/regress/regress-662674.js
@@ -0,0 +1,14 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --stack-size=100
+
+Debug = debug.Debug
+
+function overflow() {
+  return overflow();
+}
+
+Debug.setBreakOnException();
+assertThrows(overflow, RangeError);