diff --git a/CHANGELOG.MD b/CHANGELOG.MD
index b309f96a5..7a544cda6 100644
--- a/CHANGELOG.MD
+++ b/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。
 
+# 0.18.3
+
+## 问题修复
+
+- 更新条目时对于https的封面下载失败时没有保留原封面不更新
+
 # 0.18.2
 
 - 条目拉取后没有自动将封面下载到本地
diff --git a/gradle.properties b/gradle.properties
index e9f68a221..0da9441cf 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +1 @@
-version=0.18.2
+version=0.18.3
diff --git a/server/src/main/java/run/ikaros/server/core/attachment/listener/AttachmentSubjectCoverChangeListener.java b/server/src/main/java/run/ikaros/server/core/attachment/listener/AttachmentSubjectCoverChangeListener.java
index bfe786a7f..c2d918d61 100644
--- a/server/src/main/java/run/ikaros/server/core/attachment/listener/AttachmentSubjectCoverChangeListener.java
+++ b/server/src/main/java/run/ikaros/server/core/attachment/listener/AttachmentSubjectCoverChangeListener.java
@@ -2,6 +2,7 @@
 
 import static run.ikaros.api.core.attachment.AttachmentConst.COVER_DIRECTORY_ID;
 
+import java.nio.charset.StandardCharsets;
 import java.util.Objects;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
@@ -11,6 +12,7 @@
 import org.springframework.stereotype.Component;
 import org.springframework.web.client.RestTemplate;
 import reactor.core.publisher.Mono;
+import reactor.core.scheduler.Schedulers;
 import run.ikaros.api.core.attachment.AttachmentUploadCondition;
 import run.ikaros.api.infra.utils.FileUtils;
 import run.ikaros.api.store.enums.AttachmentReferenceType;
@@ -18,6 +20,7 @@
 import run.ikaros.server.core.subject.SubjectOperator;
 import run.ikaros.server.core.subject.event.SubjectRemoveEvent;
 import run.ikaros.server.core.subject.event.SubjectUpdateEvent;
+import run.ikaros.server.infra.utils.ByteArrUtils;
 import run.ikaros.server.store.entity.AttachmentEntity;
 import run.ikaros.server.store.entity.AttachmentReferenceEntity;
 import run.ikaros.server.store.entity.SubjectEntity;
@@ -105,8 +108,16 @@ public Mono<Void> onSubjectCoverUpdate(SubjectUpdateEvent event) {
             .then(Mono.just(newCover))
             .filter(StringUtils::isNotBlank)
             .filter(url -> url.startsWith("http"))
+            .publishOn(Schedulers.boundedElastic())
             .flatMap(url -> {
                 byte[] bytes = restTemplate.getForObject(url, byte[].class);
+                if (bytes == null || !ByteArrUtils.isBinaryData(bytes)) {
+                    log.warn("Download subject cover fail for url: {}", url);
+                    if (ByteArrUtils.isStringData(bytes)) {
+                        log.warn("Response: {}", new String(bytes, StandardCharsets.UTF_8));
+                    }
+                    return Mono.empty();
+                }
                 DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
                 return attachmentService.upload(AttachmentUploadCondition.builder()
                     .parentId(COVER_DIRECTORY_ID)
diff --git a/server/src/main/java/run/ikaros/server/infra/utils/ByteArrUtils.java b/server/src/main/java/run/ikaros/server/infra/utils/ByteArrUtils.java
new file mode 100644
index 000000000..212699c5e
--- /dev/null
+++ b/server/src/main/java/run/ikaros/server/infra/utils/ByteArrUtils.java
@@ -0,0 +1,31 @@
+package run.ikaros.server.infra.utils;
+
+import java.nio.charset.StandardCharsets;
+
+public class ByteArrUtils {
+    /**
+     * 判断字节数组为二进制数据.
+     */
+    public static boolean isBinaryData(byte[] data) {
+        for (byte b : data) {
+            if (b < 32 && b != 9 && b != 10 && b != 13) {
+                return true; // 存在控制字符，可能是二进制数据
+            }
+        }
+        return false; // 没有控制字符，可能是字符串
+    }
+
+    /**
+     * 判断字节数组为字符串数据.
+     */
+    public static boolean isStringData(byte[] data) {
+        try {
+            String str = new String(data, StandardCharsets.UTF_8);
+            // 检查解码后的字符串是否包含非可打印字符
+            return str.chars().allMatch(c -> c >= 32 || c == 9 || c == 10 || c == 13);
+        } catch (Exception e) {
+            return false; // 解码失败，认为是二进制数据
+        }
+    }
+
+}