diff --git a/chart2/source/view/axes/DateHelper.cxx b/chart2/source/view/axes/DateHelper.cxx
index 2e1fa3a4b867..6006d3e48bed 100644
--- a/chart2/source/view/axes/DateHelper.cxx
+++ b/chart2/source/view/axes/DateHelper.cxx
@@ -68,6 +68,9 @@ bool DateHelper::IsLessThanOneYearAway( const Date& rD1, const Date& rD2 )
 
 double DateHelper::RasterizeDateValue( double fValue, const Date& rNullDate, long TimeResolution )
 {
+    if (rtl::math::isNan(fValue))
+        return fValue;
+
     Date aDate(rNullDate); aDate.AddDays(::rtl::math::approxFloor(fValue));
     switch(TimeResolution)
     {