diff --git a/src/3rdparty/masm/stubs/WTFStubs.cpp b/src/3rdparty/masm/stubs/WTFStubs.cpp
index b26d10b3ab..f408b355f5 100644
--- a/src/3rdparty/masm/stubs/WTFStubs.cpp
+++ b/src/3rdparty/masm/stubs/WTFStubs.cpp
@@ -66,7 +66,7 @@ uint32_t cryptographicallyRandomNumber()
     return 0;
 }
 
-static FilePrintStream* s_dataFile;
+static FilePrintStream* s_dataFile = nullptr;
 
 void setDataFile(FilePrintStream *ps)
 {
diff --git a/src/3rdparty/masm/wtf/FilePrintStream.cpp b/src/3rdparty/masm/wtf/FilePrintStream.cpp
index a56b36526e..8ddf8487bd 100644
--- a/src/3rdparty/masm/wtf/FilePrintStream.cpp
+++ b/src/3rdparty/masm/wtf/FilePrintStream.cpp
@@ -39,7 +39,8 @@ FilePrintStream::~FilePrintStream()
 {
     if (m_adoptionMode == Borrow)
         return;
-    fclose(m_file);
+    if (m_file)
+        fclose(m_file);
 }
 
 std::unique_ptr<FilePrintStream> FilePrintStream::open(const char* filename, const char* mode)