fixed #1053

src/emucore/OSystem.cxx

@@ -827,9 +827,19 @@ ByteBuffer OSystem::openROM(const FSNode& rom, size_t& size,
   // Next check for a proper file size
   // Streaming ROMs read only a portion of the file
   // Otherwise the size to read is 0 (meaning read the entire file)
-  const size_t sizeToRead = CartDetector::isProbablyMVC(rom);
+  size_t sizeToRead = 0;
+  try
+  {
+    sizeToRead = CartDetector::isProbablyMVC(rom);
+  }
+  catch(const runtime_error&)
+  {
+    if(showErrorMessage)
+      throw runtime_error("File not found/readable");
+    else
+      return nullptr;
+  }
   const bool isStreaming = sizeToRead > 0;
-
   // Make sure we only read up to the maximum supported cart size
   const bool isValidSize = isValidROM && (isStreaming ||
                            rom.getSize() <= Cartridge::maxSize());