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

@@ -331,7 +331,7 @@ public class Trace {
         this.records = new SoftReference<>(records);
     }
 
-    public List<TNTPoint> getRecords() {
+    public synchronized List<TNTPoint> getRecords() {
         if (records.get() == null) {
             loadRecords();
         }