java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at water.rapids.Env.addRef(Env.java:215)
at water.rapids.Env.addRef(Env.java:214)
at water.rapids.Env.push(Env.java:149)
at water.rapids.Env.pushAry(Env.java:155)
at water.rapids.ASTSetTimeZone.apply(ASTOp.java:4338)
at water.rapids.AST.treeWalk(AST.java:54)
at water.rapids.Exec.exec(Exec.java:68)
at water.api.RapidsHandler.exec(RapidsHandler.java:37)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at water.api.Handler.handle(Handler.java:56)
at water.api.RequestServer.handle(RequestServer.java:675)
at water.api.RequestServer.serve(RequestServer.java:613)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:438)
at java.lang.Thread.run(Thread.java:745)

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