Unable to query process instances when business key is not set

Business key variable with value

 "businessKeys": [], 

, breaks data index query.

"message": "Exception while fetching data (/ProcessInstances) : org.infinispan.objectfilter.ParsingException: ISPN028526: Invalid query: from org.kie.kogito.index.model.ProcessInstance o where and o.parentProcessInstanceId is null and o.state in (1); Parser error messages: [[statement, selectStatement, querySpec, whereClause, logicalExpression, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression]: line 1:62 state 5 (decision=33) no viable alt; token=[@21,62:62='.',<25>,1:62]].",