diff --git a/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/PlainFormat.java b/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/PlainFormat.java
index ac3db657817..0b91315cfb7 100644
--- a/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/PlainFormat.java
+++ b/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/PlainFormat.java
@@ -95,7 +95,11 @@ public void output(Catalog[] catalogs) {
   static final class SchemaPlainFormat implements OutputFormat<Schema> {
     @Override
     public void output(Schema schema) {
-      System.out.println(schema.name() + "," + schema.comment());
+      if (schema == null) {
+        System.out.println("No schemas exist.");
+      } else {
+        System.out.println(schema.name() + "," + schema.comment());
+      }
     }
   }
 }
diff --git a/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/TableFormat.java b/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/TableFormat.java
index 2be9820834d..ef87e79b531 100644
--- a/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/TableFormat.java
+++ b/clients/cli/src/main/java/org/apache/gravitino/cli/outputs/TableFormat.java
@@ -109,11 +109,15 @@ public void output(Catalog[] catalogs) {
   static final class SchemaTableFormat implements OutputFormat<Schema> {
     @Override
     public void output(Schema schema) {
-      List<String> headers = Arrays.asList("schema", "comment");
-      List<List<String>> rows = new ArrayList<>();
-      rows.add(Arrays.asList(schema.name(), schema.comment() + ""));
-      TableFormatImpl tableFormat = new TableFormatImpl();
-      tableFormat.print(headers, rows);
+      if (schema == null) {
+        System.out.println("No schemas exist.");
+      } else {
+        List<String> headers = Arrays.asList("schema", "comment");
+        List<List<String>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(schema.name(), schema.comment() + ""));
+        TableFormatImpl tableFormat = new TableFormatImpl();
+        tableFormat.print(headers, rows);
+      }
     }
   }