diff --git a/htroot/Threaddump_p.java b/htroot/Threaddump_p.java
index c60ef6d0f..fd942609b 100644
--- a/htroot/Threaddump_p.java
+++ b/htroot/Threaddump_p.java
@@ -59,13 +59,13 @@ public class Threaddump_p {
     	Runtime runtime = Runtime.getRuntime();
 
     	ThreadDump.bufferappend(buffer, plain, "************* Start Thread Dump " + dt + " *******************");
-    	ThreadDump.bufferappend(buffer, plain, "");
+    	ThreadDump.bufferappend(buffer, plain, " ");
     	ThreadDump.bufferappend(buffer, plain, "YaCy Version: " + versionstring);
     	ThreadDump.bufferappend(buffer, plain, "Assigned   Memory = " + (runtime.maxMemory()));
     	ThreadDump.bufferappend(buffer, plain, "Used       Memory = " + (runtime.totalMemory() - runtime.freeMemory()));
     	ThreadDump.bufferappend(buffer, plain, "Available  Memory = " + (runtime.maxMemory() - runtime.totalMemory() + runtime.freeMemory()));
-    	ThreadDump.bufferappend(buffer, plain, "");
-    	ThreadDump.bufferappend(buffer, plain, "");
+    	ThreadDump.bufferappend(buffer, plain, " ");
+    	ThreadDump.bufferappend(buffer, plain, " ");
 
     	int multipleCount = 100;
     	File appPath = sb.getAppPath();
@@ -91,7 +91,7 @@ public class Threaddump_p {
                 }
             } else if (OS.canExecUnix) {
                 ThreadDump.bufferappend(buffer, plain, "this thread dump function can find threads that lock others, to enable this function start YaCy with 'startYACY.sh -l'");
-                ThreadDump.bufferappend(buffer, plain, "");
+                ThreadDump.bufferappend(buffer, plain, " ");
             }
 
             // generate a single thread dump
diff --git a/source/net/yacy/kelondro/logging/ThreadDump.java b/source/net/yacy/kelondro/logging/ThreadDump.java
index 126b4d97f..ee2b035a4 100644
--- a/source/net/yacy/kelondro/logging/ThreadDump.java
+++ b/source/net/yacy/kelondro/logging/ThreadDump.java
@@ -270,23 +270,23 @@ public class ThreadDump extends HashMap<ThreadDump.StackTrace, List<String>> imp
             final boolean plain,
             final Thread.State stateIn) {
         bufferappend(buffer, plain, "THREADS WITH STATES: " + stateIn.toString());
-        bufferappend(buffer, plain, "");
+        bufferappend(buffer, plain, "&nbsp;");
 
         // write dumps
         for (final Map.Entry<StackTrace, List<String>> entry: entrySet()) {
             final List<String> threads = entry.getValue();
             for (final String t: threads) bufferappend(buffer, plain, t);
             bufferappend(buffer, plain, entry.getKey().text);
-            bufferappend(buffer, plain, "");
+            bufferappend(buffer, plain, "&nbsp;");
         }
-        bufferappend(buffer, plain, "");
+        bufferappend(buffer, plain, "&nbsp;");
     }
 
     public void appendBlockTraces(
             final StringBuilder buffer,
             final boolean plain) {
         bufferappend(buffer, plain, "THREADS WITH STATES: LOCK FOR OTHERS");
-        bufferappend(buffer, plain, "");
+        bufferappend(buffer, plain, "&nbsp;");
 
         final Map<StackTrace, Integer> locks = countLocks();
         for (int i = size() + 10; i > 0; i--) {
@@ -297,11 +297,11 @@ public class ThreadDump extends HashMap<ThreadDump.StackTrace, List<String>> imp
                     if (list == null) continue;
                     bufferappend(buffer, plain, "Thread= " + entry.getKey());
                     for (final String s: list) bufferappend(buffer, plain, "  " + (plain ? s : s.replaceAll("<", "&lt;").replaceAll(">", "&gt;")));
-                    bufferappend(buffer, plain, "");
+                    bufferappend(buffer, plain, "&nbsp;");
                 }
             }
         }
-        bufferappend(buffer, plain, "");
+        bufferappend(buffer, plain, "&nbsp;");
     }
 
 
@@ -333,7 +333,7 @@ public class ThreadDump extends HashMap<ThreadDump.StackTrace, List<String>> imp
             bufferappend(buffer, plain, "Occurrences: " + e.getValue());
             bufferappend(buffer, plain, e.getKey());
         }
-        bufferappend(buffer, plain, "");
+        bufferappend(buffer, plain, "&nbsp;");
     }
 
     private static Map.Entry<String, Integer> removeMax(final Map<String, Integer> result) {