diff --git a/ecmascript/builtins/builtins_function.cpp b/ecmascript/builtins/builtins_function.cpp
index d31c26f623..1c33083392 100644
--- a/ecmascript/builtins/builtins_function.cpp
+++ b/ecmascript/builtins/builtins_function.cpp
@@ -276,7 +276,11 @@ JSTaggedValue BuiltinsFunction::FunctionPrototypeToString(EcmaRuntimeCallInfo *a
         tooling::JSPtExtractor *debugExtractor =
                 JSPandaFileManager::GetInstance()->GetJSPtExtractor(method->GetJSPandaFile());
         const std::string &sourceCode = debugExtractor->GetSourceCode(method->GetMethodId());
-        return GetTaggedString(thread, sourceCode.c_str());
+        if (!sourceCode.empty()) {
+            return GetTaggedString(thread, sourceCode.c_str());
+        } else {
+            return GetTaggedString(thread, "Cannot get source code of funtion");
+        }
     }
 
     THROW_TYPE_ERROR_AND_RETURN(thread,
diff --git a/ecmascript/jspandafile/debug_info_extractor.cpp b/ecmascript/jspandafile/debug_info_extractor.cpp
index 4cdc1a43b6..add5964886 100644
--- a/ecmascript/jspandafile/debug_info_extractor.cpp
+++ b/ecmascript/jspandafile/debug_info_extractor.cpp
@@ -196,9 +196,15 @@ void DebugInfoExtractor::Extract(const panda_file::File *pf)
             LineNumberProgramProcessor<LineNumberProgramHandler> programProcessor(program, &handler);
             programProcessor.Process();
 
+            const char *sourceFile = "";
+            if (state.HasFile()) {
+                sourceFile = reinterpret_cast<const char *>(handler.GetFile());
+            }
+            const char *sourceCode = "";
+            if (state.HasSourceCode()) {
+                sourceCode = reinterpret_cast<const char *>(handler.GetSourceCode());
+            }
             panda_file::File::EntityId methodId = mda.GetMethodId();
-            const char *sourceFile = reinterpret_cast<const char *>(handler.GetFile());
-            const char *sourceCode = reinterpret_cast<const char *>(handler.GetSourceCode());
             methods_.insert(std::make_pair(methodId.GetOffset(), MethodDebugInfo {sourceFile, sourceCode,
                                            handler.GetLineNumberTable(),
                                            handler.GetColumnNumberTable(),