Don't crash FCHost when console.log is called from unknown contexts

FCHost/fchost/fchost_handler.cc

@@ -4,6 +4,7 @@
 
 #include "fchost_handler.h"
 
+#include <iostream>
 #include <sstream>
 #include <string>
 #include <fstream>
@@ -73,7 +74,13 @@ bool FCHostHandler::OnConsoleMessage(CefRefPtr<CefBrowser> browser, cef_log_seve
 									 const CefString& message, const CefString& source, int line)
 {
 	std::ofstream s("console.log", std::ios_base::app);
-	s << DateTime() << " - " << source.c_str() << ":" << line << ": " << message.c_str() << "\n";
+	s << DateTime() << " - ";
+    if (source.c_str()) {
+        s << source.c_str();
+    } else {
+        s << "Unknown Source";
+    }
+    s << ":" << line << ": " << message.c_str() << "\n";
 	s.flush();
 	s.close();