diff --git a/src/api.cc b/src/api.cc
index cf3cda37fb..d094dbd55c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1637,6 +1637,12 @@ Local<UnboundScript> ScriptCompiler::CompileUnbound(
     options = kConsumeParserCache;
   }
 
+  // Don't try to produce any kind of cache when the debugger is loaded.
+  if (isolate->debug()->is_loaded() &&
+      (options == kProduceParserCache || options == kProduceCodeCache)) {
+    options = kNoCompileOptions;
+  }
+
   i::ScriptData* script_data = NULL;
   if (options == kConsumeParserCache || options == kConsumeCodeCache) {
     DCHECK(source->cached_data);
diff --git a/src/compiler.cc b/src/compiler.cc
index 1427f623b8..6f5532ed16 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -1257,19 +1257,20 @@ Handle<SharedFunctionInfo> Compiler::CompileScript(
     int column_offset, bool is_shared_cross_origin, Handle<Context> context,
     v8::Extension* extension, ScriptData** cached_data,
     ScriptCompiler::CompileOptions compile_options, NativesFlag natives) {
+  Isolate* isolate = source->GetIsolate();
   if (compile_options == ScriptCompiler::kNoCompileOptions) {
     cached_data = NULL;
   } else if (compile_options == ScriptCompiler::kProduceParserCache ||
              compile_options == ScriptCompiler::kProduceCodeCache) {
     DCHECK(cached_data && !*cached_data);
     DCHECK(extension == NULL);
+    DCHECK(!isolate->debug()->is_loaded());
   } else {
     DCHECK(compile_options == ScriptCompiler::kConsumeParserCache ||
            compile_options == ScriptCompiler::kConsumeCodeCache);
     DCHECK(cached_data && *cached_data);
     DCHECK(extension == NULL);
   }
-  Isolate* isolate = source->GetIsolate();
   int source_length = source->length();
   isolate->counters()->total_load_size()->Increment(source_length);
   isolate->counters()->total_compile_size()->Increment(source_length);