Bug in MCPD Converter

Something's wrong with MCPD conversion:

10:25:02,643 qtp1032616650-21 ERROR ApiExceptionHandler:235 - Wow! Such! Exception!
com.google.common.util.concurrent.UncheckedExecutionException: java.lang.ClassCastException: class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap')
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2051)
	at com.google.common.cache.LocalCache.get(LocalCache.java:3962)
	at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4859)
	at org.gringlobal.worker.AccessionMCPDConverter.findMcpdOfCodeValue(AccessionMCPDConverter.java:82)
	at org.gringlobal.worker.AccessionMCPDConverter.convert(AccessionMCPDConverter.java:147)
...
	at org.gringlobal.service.impl.AccessionServiceImpl.listMCPD(AccessionServiceImpl.java:360)
...
	at org.gringlobal.api.v1.impl.AccessionController.listMcpd(AccessionController.java:133)
Caused by: java.lang.ClassCastException: class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap')
	at com.sun.proxy.$Proxy626.findMcpdOfCodeValue(Unknown Source)
	at org.gringlobal.worker.AccessionMCPDConverter.lambda$findMcpdOfCodeValue$0(AccessionMCPDConverter.java:83)
	at com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4864)