diff --git a/core/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java b/core/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java
index e0ddca5ea..39e987d5c 100644
--- a/core/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java
+++ b/core/src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java
@@ -2951,7 +2951,11 @@ public class PGOutputVisitor extends SQLASTOutputVisitor implements PGASTVisitor
         Integer seed = x.getSeed();
         if (seed != null) {
             print0(ucase ? " (INCREMENT BY " : " (increment by ");
-            print(x.getIncrement());
+            if (x.getIncrement() != null) {
+                print(x.getIncrement());
+            } else {
+                print('1');
+            }
             print0(ucase ? " START WITH  " : " start with  ");
             print(seed);
             print(')');