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

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java.lang.NullPointerException:
at at.asitplus.regkassen.core.base.util.CashBoxUtils.getQRCodeRepresentationFromJWSCompactRepresentation(CashBoxUtils.java:136)
at at.asitplus.regkassen.verification.core.verification.verificationmodules.CashBoxIDAndReceiptIdentifierAreUniqueVerificationModule.verify(CashBoxIDAndReceiptIdentifierAreUniqueVerificationModule.java:62)
at at.asitplus.regkassen.verification.core.verification.verificationmodules.DEPExportFormatVerificationModule.verify(DEPExportFormatVerificationModule.java:139)
at at.asitplus.regkassen.verification.cmdline.CheckDEPExportFormat.main(CheckDEPExportFormat.java:85)

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