TeslaCN commented on code in PR #19394:
URL: https://github.com/apache/shardingsphere/pull/19394#discussion_r926156730


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shardingsphere-features/shardingsphere-encrypt/shardingsphere-encrypt-core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/generator/EncryptInsertValuesTokenGenerator.java:
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@@ -77,6 +77,9 @@ public InsertValuesToken generateSQLToken(final 
InsertStatementContext insertSta
     }
     
     private Optional<SQLToken> findPreviousSQLToken(final Class<?> sqlToken) {
+        if (null == previousSQLTokens) {

Review Comment:
   > a NPE when previousSQLTokens is null
   
   previousSQLTokens is Collection, null value is not allowed for a Collection 
in ShardingSphere's code style.



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