Fix #197

Author: TobiGr

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -575,21 +575,26 @@ public StreamInfoItemsCollector getRelatedStreams() throws IOException, Extracti
      */
     @Override
     public String getErrorMessage() {
-        String errorMessage = doc.select("h1[id=\"unavailable-message\"]").first().text();
         StringBuilder errorReason;
+        Element errorElement = doc.select("h1[id=\"unavailable-message\"]").first();
 
-        if (errorMessage == null || errorMessage.isEmpty()) {
+        if (errorElement == null) {
             errorReason = null;
-        } else if (errorMessage.contains("GEMA")) {
-            // Gema sometimes blocks youtube music content in germany:
-            // https://www.gema.de/en/
-            // Detailed description:
-            // https://en.wikipedia.org/wiki/GEMA_%28German_organization%29
-            errorReason = new StringBuilder("GEMA");
         } else {
-            errorReason = new StringBuilder(errorMessage);
-            errorReason.append("  ");
-            errorReason.append(doc.select("[id=\"unavailable-submessage\"]").first().text());
+            String errorMessage = errorElement.text();
+            if (errorMessage == null || errorMessage.isEmpty()) {
+                errorReason = null;
+            } else if (errorMessage.contains("GEMA")) {
+                // Gema sometimes blocks youtube music content in germany:
+                // https://www.gema.de/en/
+                // Detailed description:
+                // https://en.wikipedia.org/wiki/GEMA_%28German_organization%29
+                errorReason = new StringBuilder("GEMA");
+            } else {
+                errorReason = new StringBuilder(errorMessage);
+                errorReason.append("  ");
+                errorReason.append(doc.select("[id=\"unavailable-submessage\"]").first().text());
+            }
         }
 
         return errorReason != null ? errorReason.toString() : null;