Statement.cancel() could cause a NullPointerException.

h2/src/docsrc/html/changelog.html

@@ -18,7 +18,9 @@ Change Log
 <h1>Change Log</h1>
 
 <h2>Next Version (unreleased)</h2>
-<ul><li>In some cases (specially when using a small cache size or a large database over 1 GB) for some
+<ul><li>Statement.cancel() did not work when running RUNSCRIPT and SCRIPT.
+</li><li>Statement.cancel() could cause a NullPointerException.
+</li><li>In some cases (specially when using a small cache size or a large database over 1 GB) for some
     operations like ALTER TABLE the data was written before the transaction log entries, which could cause a corrupt database
     if the process was killed during the ALTER TABLE operation. Thanks a lot to Victor Pyankov for helping solve this problem!
 </li><li>The Recover tool could throw a ArrayIndexOutOfBoundsException

h2/src/main/org/h2/jdbc/JdbcConnection.java

@@ -1360,7 +1360,9 @@ public class JdbcConnection extends TraceObject implements Connection {
      * Called after executing a command that could have written something.
      */
     protected void afterWriting() {
-        session.afterWriting();
+        if (session != null) {
+            session.afterWriting();
+        }
     }
 
     String getURL() throws SQLException {