prevent npe

htroot/HostBrowser.java

@@ -58,6 +58,7 @@ import net.yacy.search.index.Fulltext;
 import net.yacy.search.index.Segment.ReferenceReport;
 import net.yacy.search.index.Segment.ReferenceReportCache;
 import net.yacy.search.query.QueryParams;
+import net.yacy.search.schema.CollectionConfiguration.FailDoc;
 import net.yacy.search.schema.CollectionSchema;
 import net.yacy.server.serverObjects;
 import net.yacy.server.serverSwitch;
@@ -463,7 +464,8 @@ public class HostBrowser {
                                 FailType failType = errorDocs.get(entry.getKey());
                                 if (failType == null) {
                                     // maybe this is only in the errorURL
-                                    prop.putHTML("files_list_" + c + "_type_stored_error", process == HarvestProcess.ERRORS ? sb.crawlQueues.errorURL.get(ASCII.String(uri.hash())).getFailReason() : "unknown error");
+                                    FailDoc faildoc = sb.crawlQueues.errorURL.get(ASCII.String(uri.hash()));
+                                    prop.putHTML("files_list_" + c + "_type_stored_error", process == HarvestProcess.ERRORS && faildoc != null ? faildoc.getFailReason() : "unknown error");
                                 } else {
                                     String ids = ASCII.String(uri.hash());
                                     InfoCacheEntry ice = infoCache.get(ids);

source/net/yacy/crawler/CrawlStacker.java

@@ -422,8 +422,8 @@ public final class CrawlStacker {
                 }
                 if (dbocc == HarvestProcess.ERRORS) {
                     final CollectionConfiguration.FailDoc errorEntry = this.nextQueue.errorURL.get(urlhash);
-                    if (CrawlStacker.log.isInfo()) CrawlStacker.log.info("URL '" + urlstring + "' is double registered in '" + dbocc.toString() + "', previous cause: " + errorEntry.getFailReason());
-                    return "double in: errors (" + errorEntry.getFailReason() + "), oldDate = " + oldDate.toString();
+                    if (CrawlStacker.log.isInfo()) CrawlStacker.log.info("URL '" + urlstring + "' is double registered in '" + dbocc.toString() + "', previous cause: " + (errorEntry == null ? "NULL" : errorEntry.getFailReason()));
+                    return "double in: errors (" + (errorEntry == null ? "NULL" : errorEntry.getFailReason()) + "), oldDate = " + oldDate.toString();
                 }
                 if (CrawlStacker.log.isInfo()) CrawlStacker.log.info("URL '" + urlstring + "' is double registered in '" + dbocc.toString() + "'. ");
                 return "double in: " + dbocc.toString() + ", oldDate = " + oldDate.toString();