Try close tikaStream

module/src/main/java/pl/clarin/any2txt/Converter.java

@@ -115,12 +115,14 @@ public class Converter extends Worker {
             Logger.getLogger(Converter.class.getName()).log(Level.WARNING, "Problems in Tika processing " + ex.getMessage() , ex.getMessage());
             if (ex.getMessage().contains("XML parse error")) {
                 try {
+                    if (inS != null){
                         try {
                             inS.close();
                         }
                         catch (IOException exp) {
                             Logger.getLogger(Converter.class.getName()).log(Level.WARNING, "Problems with closing TikaInputStream " + exp.getMessage() , exp.getMessage());
                         }
+                    }
                     Logger.getLogger(Converter.class.getName()).log(Level.INFO, "Filename " + fileIn + " " + new File(".").getAbsolutePath());
                     DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
                     Document doc = builder.parse(new File(fileIn));