fix: close issue #752 that null value eq issue (#753)

* build: upgrade to v0.20.8

* fix: close issue #752 that null value eq issue

CHANGELOG.MD

@@ -2,6 +2,12 @@
 
 更新日志文档，版本顺序从新到旧，最新版本在最前(上)面。
 
+# 0.20.8
+
+## 问题修复
+
+- 条目收藏更新的数值转化问题 #752
+
 # 0.20.7
 
 ## 新特性

gradle.properties

@@ -1 +1 @@
-version=0.20.7
+version=0.20.8

server/src/main/java/run/ikaros/server/core/collection/SubjectCollectionImpl.java

@@ -107,7 +107,8 @@ public Mono<Void> collect(SubjectCollection subjectCollection) {
                             applicationEventPublisher.publishEvent(event);
                         }))
                     .doOnNext(entity -> {
-                        if (entity.getScore() != newScore) {
+                        if (entity != null && entity.getScore() != null
+                            && newScore != entity.getScore()) {
                             SubjectCollectionScoreUpdateEvent event
                                 = new SubjectCollectionScoreUpdateEvent(
                                 this, entity.getSubjectId());