check for null pointer

Log.cpp

@@ -56,7 +56,7 @@ namespace log {
 #endif
 			case eLogFile:
 			case eLogStream:
-				m_LogStream->flush();
+					if (m_LogStream) m_LogStream->flush();
 				break;
 			default:
 				/* do nothing */
@@ -107,6 +107,7 @@ namespace log {
 #endif
 				case eLogFile:
 				case eLogStream:
+					if (m_LogStream)
 						*m_LogStream << TimeAsString(msg->timestamp)
 							<< "@" << short_tid
 							<< "/" << g_LogLevelStr[msg->level]