Added debug message for trace history map nullpointer and potential fix

BauSystem_Main/src/de/steamwar/bausystem/features/tracer/TraceRecorder.java

@@ -23,6 +23,7 @@ import de.steamwar.bausystem.BauSystem;
 import de.steamwar.bausystem.features.tpslimit.TPSUtils;
 import de.steamwar.bausystem.region.Region;
 import de.steamwar.linkage.Linked;
+import org.bukkit.Bukkit;
 import org.bukkit.block.Block;
 import org.bukkit.entity.TNTPrimed;
 import org.bukkit.event.EventHandler;
@@ -32,6 +33,8 @@ import org.bukkit.event.entity.EntityExplodeEvent;
 import org.bukkit.event.entity.EntitySpawnEvent;
 
 import java.util.*;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 @Linked
 public class TraceRecorder implements Listener {
@@ -158,14 +161,23 @@ public class TraceRecorder implements Listener {
         List<TNTPoint> history = historyMap.getOrDefault(tntPrimed, new ArrayList<>());
 
         // Failsave for tnt entering unloaded chunks
-        if (tntPrimed.isDead() || history.size() > 0 && history.get(history.size() - 1).getFuse() == tntPrimed.getFuseTicks()) {
+        if (tntPrimed == null || tntPrimed.isDead() || history.size() > 0 && history.get(history.size() - 1).getFuse() == tntPrimed.getFuseTicks()) {
             return null;
         }
 
         int tntID;
 
         if (history.size() == 0) {
-            historyMap.put(tntPrimed, history);
+            try {
+                historyMap.put(tntPrimed, history);
+            }
+            catch (NullPointerException e) {
+                Logger logger = Bukkit.getLogger();
+                logger.log(Level.WARNING, "Nullpointer thrown by historyMap");
+                logger.log(Level.WARNING, "TNT History: " + history);
+                logger.log(Level.WARNING, "History Map" + history);
+                throw  e;
+            }
             tntID = wrappedTrace.getNextOpenRecordIdAndIncrement();
         } else {
             tntID = history.get(0).getTntId();