[2.8.3] Fix #44

Plan/src/main/java/com/djrapitops/plan/utilities/AnalysisUtils.java

@@ -85,8 +85,9 @@ public class AnalysisUtils {
     }
     
     public static List<Long> transformSessionDataToLengths(Collection<SessionData> data) {
+        List<SessionData> d = new ArrayList<>(data);
         List<Long> list = new ArrayList<>();
-        data.stream().forEach((sData) -> {
+        d.stream().forEach((sData) -> {
             list.add(sData.getSessionEnd()-sData.getSessionStart());
         });
         return list;

Plan/src/main/resources/plugin.yml

@@ -1,7 +1,7 @@
 name: Plan
 author: Rsl1122
 main: main.java.com.djrapitops.plan.Plan
-version: 2.8.2
+version: 2.8.3
 
 softdepend:
 - OnTime