Fix null reference exception in GenFragmentationPercent method (#2211)

Copilot · brianrob · web-flow · commit 2cec03fb848c · 2025-05-27T08:36:17.000-07:00
* Initial plan for issue

* Fix GenFragmentationPercent null reference exception by adding HeapStats null check

Co-authored-by: brianrob &lt;6210322+brianrob@users.noreply.github.com&gt;

---------

Co-authored-by: copilot-swe-agent[bot] &lt;198982749+Copilot@users.noreply.github.com&gt;
Co-authored-by: brianrob &lt;6210322+brianrob@users.noreply.github.com&gt;
diff --git a/src/TraceEvent/Computers/TraceManagedProcess.cs b/src/TraceEvent/Computers/TraceManagedProcess.cs
@@ -2193,6 +2193,11 @@ public double SurvivalPercent(Gens gen)
         /// <returns></returns>
         public double GenSizeAfterMB(Gens gen)
         {
+            if (HeapStats == null)
+            {
+                return double.NaN;
+            }
+            
             if (gen == Gens.GenPinObj)
             {
                 return HeapStats.GenerationSize4 / 1000000.0;

Original file line number	Diff line number	Diff line change
`@@ -2193,6 +2193,11 @@ public double SurvivalPercent(Gens gen)`
`2193`	`2193`	`/// <returns></returns>`
`2194`	`2194`	`public double GenSizeAfterMB(Gens gen)`
`2195`	`2195`	`{`
	`2196`	`+ if (HeapStats == null)`
	`2197`	`+ {`
	`2198`	`+ return double.NaN;`
	`2199`	`+ }`
	`2200`	`+`
`2196`	`2201`	`if (gen == Gens.GenPinObj)`
`2197`	`2202`	`{`
`2198`	`2203`	`return HeapStats.GenerationSize4 / 1000000.0;`