Index: System tests/AutomatedSystemTests/AutomatedSystemTests/Modules/ActionsDocumentView/ValidateSectionResultAsCombinationContributionsInFMResultView.cs
===================================================================
diff -u -rfd561b4870aa75036f65dd1ed6324ad5c307a182 -rdb1377a6e317545ee095d3a9760a8feaa44dfa65
--- System tests/AutomatedSystemTests/AutomatedSystemTests/Modules/ActionsDocumentView/ValidateSectionResultAsCombinationContributionsInFMResultView.cs	(.../ValidateSectionResultAsCombinationContributionsInFMResultView.cs)	(revision fd561b4870aa75036f65dd1ed6324ad5c307a182)
+++ System tests/AutomatedSystemTests/AutomatedSystemTests/Modules/ActionsDocumentView/ValidateSectionResultAsCombinationContributionsInFMResultView.cs	(.../ValidateSectionResultAsCombinationContributionsInFMResultView.cs)	(revision db1377a6e317545ee095d3a9760a8feaa44dfa65)
@@ -114,6 +114,7 @@
             }
             return indexColumnCombinedProbability;
         }
+        
         private void ValidateSectionResult(DataSectionScenariosView data, string actualProb)
         {
             System.Globalization.CultureInfo currentCulture = CultureInfo.CurrentCulture;
@@ -139,12 +140,21 @@
         {
             double actualValue = ProbabilityFractionToDouble(actualProbFraction);
             double expectedValue = ProbabilityFractionToDouble(expectedProbFraction);
-            return Math.Abs(actualValue-expectedValue) / expectedValue;
+            return Math.Abs(actualValue-expectedValue) / (expectedValue + 1.0e-20);
         }
         
         private double ProbabilityFractionToDouble(string probabilityFraction)
         {
-            return 1.0 / Int64.Parse(probabilityFraction.Substring(2, probabilityFraction.Length-2));
+            string denominator = probabilityFraction.Substring(2, probabilityFraction.Length-2);
+            if (denominator=="Oneindig") {
+                return 0.0;
+            } else {
+                try {
+                    return 1.0 / Int64.Parse(denominator);
+                } catch (Exception) {
+                    throw new Exception($"Bad-formed probability: {probabilityFraction}");
+                }
+            }
         }
         
         private double GetExpectedSumWeightedProbs(DataSectionScenariosView data, System.Globalization.CultureInfo currentCulture)