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Have you looked into why we did not have this problem originally without this change?
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Now we return null as a string. I am not sure where we made that change though.
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Can you try to locate where we made that change?
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This is what is causing the issue:
openmrs-module-legacyui/omod/src/main/java/org/openmrs/web/dwr/PersonListItem.java
Lines 120 to 124 in f29296d
WebUtil.escapeHTML() converts null to a string.
This was introduced here: https://github.com/openmrs/openmrs-module-legacyui/pull/191/files