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quantumagi · quantumagi · commit 7a3a75b7293a · 2022-05-11T22:25:33.000+10:00
diff --git a/src/Stratis.Features.FederatedPeg/TargetChain/MaturedBlocksSyncManager.cs b/src/Stratis.Features.FederatedPeg/TargetChain/MaturedBlocksSyncManager.cs
@@ -152,7 +152,8 @@ public void RecordCounterChainActivations()
                 return;
             }
 
-            int mainChainLockedInHeight = this.chainIndexer.Tip.EnumerateToGenesis().TakeWhile(h => h.Header.Time >= (uint)(model.LockedInTimestamp)).LastOrDefault().Height;
+            // The above condition ensures that the 'Last' below will always return a value.
+            int mainChainLockedInHeight = this.chainIndexer.Tip.EnumerateToGenesis().TakeWhile(h => h.Header.Time >= (uint)(model.LockedInTimestamp)).Last().Height;
 
             Network counterChainNetwork = this.counterChainSettings.CounterChainNetwork;
             this.mainChainActivationHeight = mainChainLockedInHeight + 

Original file line number	Diff line number	Diff line change
`@@ -152,7 +152,8 @@ public void RecordCounterChainActivations()`
`152`	`152`	`return;`
`153`	`153`	`}`
`154`	`154`
`155`		`- int mainChainLockedInHeight = this.chainIndexer.Tip.EnumerateToGenesis().TakeWhile(h => h.Header.Time >= (uint)(model.LockedInTimestamp)).LastOrDefault().Height;`
	`155`	`+ // The above condition ensures that the 'Last' below will always return a value.`
	`156`	`+ int mainChainLockedInHeight = this.chainIndexer.Tip.EnumerateToGenesis().TakeWhile(h => h.Header.Time >= (uint)(model.LockedInTimestamp)).Last().Height;`
`156`	`157`
`157`	`158`	`Network counterChainNetwork = this.counterChainSettings.CounterChainNetwork;`
`158`	`159`	`this.mainChainActivationHeight = mainChainLockedInHeight +`