diff --git a/server/skillhub-search/src/main/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryService.java b/server/skillhub-search/src/main/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryService.java
index bdc46a33..cff32f52 100644
--- a/server/skillhub-search/src/main/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryService.java
+++ b/server/skillhub-search/src/main/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryService.java
@@ -134,7 +134,8 @@ public class PostgresFullTextQueryService implements SearchQueryService {
         if (hasComplianceStandard) {
             sql.append("AND EXISTS (");
             sql.append("SELECT 1 FROM jsonb_array_elements(");
-            sql.append("COALESCE(latest.parsed_metadata_json -> 'frontmatter' -> 'x-astron-compliance', '[]'::jsonb)");
+            sql.append("CASE WHEN jsonb_typeof(latest.parsed_metadata_json -> 'frontmatter' -> 'x-astron-compliance') = 'array' ");
+            sql.append("THEN latest.parsed_metadata_json -> 'frontmatter' -> 'x-astron-compliance' ELSE '[]'::jsonb END");
             sql.append(") AS compliance_item ");
             sql.append("WHERE LOWER(BTRIM(compliance_item ->> 'standard')) = :complianceStandard");
             sql.append(") ");
diff --git a/server/skillhub-search/src/test/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryServiceTest.java b/server/skillhub-search/src/test/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryServiceTest.java
index 6e6dfc14..b5cf9190 100644
--- a/server/skillhub-search/src/test/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryServiceTest.java
+++ b/server/skillhub-search/src/test/java/com/iflytek/skillhub/search/postgres/PostgresFullTextQueryServiceTest.java
@@ -326,7 +326,10 @@ class PostgresFullTextQueryServiceTest {
         ArgumentCaptor<String> sqlCaptor = ArgumentCaptor.forClass(String.class);
         verify(entityManager, org.mockito.Mockito.times(2)).createNativeQuery(sqlCaptor.capture());
         assertThat(sqlCaptor.getAllValues().getFirst()).contains(
-                "jsonb_array_elements(COALESCE(latest.parsed_metadata_json -> 'frontmatter' -> 'x-astron-compliance', '[]'::jsonb))"
+                "jsonb_array_elements(CASE WHEN jsonb_typeof(latest.parsed_metadata_json -> 'frontmatter' -> 'x-astron-compliance') = 'array'"
+        );
+        assertThat(sqlCaptor.getAllValues().getFirst()).contains(
+                "THEN latest.parsed_metadata_json -> 'frontmatter' -> 'x-astron-compliance' ELSE '[]'::jsonb END)"
         );
         assertThat(sqlCaptor.getAllValues().getFirst()).contains("LOWER(BTRIM(compliance_item ->> 'standard')) = :complianceStandard");
         verify(nativeQuery).setParameter("complianceStandard", "gdpr");