Thanks for the contribution!

When I try to run tests on latest trunk with these changes I get three unit-test failures because of an NPE in Baseifs.java, can you take a look?

java.lang.NullPointerException at org.apache.poi.ss.formula.functions.Baseifs.accumulate(Baseifs.java:174) at org.apache.poi.ss.formula.functions.Baseifs.aggregateMatchingCells(Baseifs.java:157) at org.apache.poi.ss.formula.functions.Baseifs.evaluate(Baseifs.java:80) at org.apache.poi.ss.formula.functions.Countifs.evaluate(Countifs.java:31) at org.apache.poi.ss.formula.UserDefinedFunction.evaluate(UserDefinedFunction.java:59) at org.apache.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:140) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:529) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:258) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluate(WorkbookEvaluator.java:199) at org.apache.poi.xssf.usermodel.BaseXSSFFormulaEvaluator.evaluateFormulaCellValue(BaseXSSFFormulaEvaluator.java:57) at org.apache.poi.ss.formula.BaseFormulaEvaluator.evaluate(BaseFormulaEvaluator.java:109) at org.apache.poi.ss.tests.formula.functions.TestCountifs.testBug56822(TestCountifs.java:118)

java.lang.NullPointerException at org.apache.poi.ss.formula.functions.Baseifs.accumulate(Baseifs.java:174) at org.apache.poi.ss.formula.functions.Baseifs.aggregateMatchingCells(Baseifs.java:157) at org.apache.poi.ss.formula.functions.Baseifs.evaluate(Baseifs.java:80) at org.apache.poi.ss.formula.functions.Countifs.evaluate(Countifs.java:31) at org.apache.poi.ss.formula.UserDefinedFunction.evaluate(UserDefinedFunction.java:59) at org.apache.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:140) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:529) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:258) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluate(WorkbookEvaluator.java:199) at org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator.evaluateFormulaCellValue(HSSFFormulaEvaluator.java:201) at org.apache.poi.ss.formula.BaseFormulaEvaluator.evaluate(BaseFormulaEvaluator.java:109) at org.apache.poi.ss.tests.formula.functions.TestCountifs.testCallFunction(TestCountifs.java:83)

java.lang.NullPointerException at org.apache.poi.ss.formula.functions.Baseifs.accumulate(Baseifs.java:174) at org.apache.poi.ss.formula.functions.Baseifs.aggregateMatchingCells(Baseifs.java:157) at org.apache.poi.ss.formula.functions.Baseifs.evaluate(Baseifs.java:80) at org.apache.poi.ss.formula.functions.Countifs.evaluate(Countifs.java:31) at org.apache.poi.ss.formula.UserDefinedFunction.evaluate(UserDefinedFunction.java:59) at org.apache.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:140) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:529) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:258) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateReference(WorkbookEvaluator.java:785) at org.apache.poi.ss.formula.SheetRefEvaluator.getEvalForCell(SheetRefEvaluator.java:48) at org.apache.poi.ss.formula.SheetRangeEvaluator.getEvalForCell(SheetRangeEvaluator.java:74) at org.apache.poi.ss.formula.LazyRefEval.getInnerValueEval(LazyRefEval.java:39) at org.apache.poi.ss.formula.eval.OperandResolver.chooseSingleElementFromRef(OperandResolver.java:216) at org.apache.poi.ss.formula.eval.OperandResolver.getSingleValue(OperandResolver.java:64) at org.apache.poi.ss.formula.eval.RelationalOperationEval.evaluate(RelationalOperationEval.java:64) at org.apache.poi.ss.formula.functions.Fixed2ArgFunction.evaluate(Fixed2ArgFunction.java:31) at org.apache.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:138) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:529) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:258) at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateReference(WorkbookEvaluator.java:785) at org.apache.poi.ss.formula.SheetRefEvaluator.getEvalForCell(SheetRefEvaluator.java:48) at org.apache.poi.ss.formula.SheetRangeEvaluator.getEvalForCell(SheetRangeEvaluator.java:74) at org.apache.poi.ss.formula.LazyRefEval.getInnerValueEval(LazyRefEval.java:39) at org.apache.poi.ss.formula.EvaluationConditionalFormatRule.unwrapEval(EvaluationConditionalFormatRule.java:391) at org.apache.poi.ss.formula.EvaluationConditionalFormatRule.checkFormula(EvaluationConditionalFormatRule.java:401) at org.apache.poi.ss.formula.EvaluationConditionalFormatRule.matches(EvaluationConditionalFormatRule.java:330) at org.apache.poi.ss.formula.ConditionalFormattingEvaluator.getConditionalFormattingForCell(ConditionalFormattingEvaluator.java:182) at org.apache.poi.ss.tests.usermodel.TestConditionalFormattingEval.getRulesFor(TestConditionalFormattingEval.java:190) at org.apache.poi.ss.tests.usermodel.TestConditionalFormattingEval.testFormattingEvaluation(TestConditionalFormattingEval.java:120)

thanks - merged using 47d80f1