diff --git a/src/Games/NexusMods.Games.FOMOD/CoreDelegates/UiDelegate.cs b/src/Games/NexusMods.Games.FOMOD/CoreDelegates/UiDelegate.cs
index 590b98b2ec..89c0ee35b3 100644
--- a/src/Games/NexusMods.Games.FOMOD/CoreDelegates/UiDelegate.cs
+++ b/src/Games/NexusMods.Games.FOMOD/CoreDelegates/UiDelegate.cs
@@ -85,6 +85,9 @@ public void ReportError(
 
     public void UpdateState(FomodInstaller.Interface.ui.InstallerStep[] installSteps, int currentStepId)
     {
+        // NOTE (erri120): The FOMOD library we're using can send us stupid inputs.
+        if (currentStepId < 0 || currentStepId >= installSteps.Length) return;
+
         // NOTE (erri120): The FOMOD library we're using was designed for threading in JavaScript.
         // A semaphore is required because the library can spawn multiple tasks on different threads
         // that will call this method multiple times. This can lead to double-state and it's
@@ -92,8 +95,6 @@ public void UpdateState(FomodInstaller.Interface.ui.InstallerStep[] installSteps
         using var waiter = _semaphoreSlim.CustomWait(TimeSpan.Zero);
         if (!waiter.HasEntered) return;
 
-        Debug.Assert(currentStepId >= 0 && currentStepId < installSteps.Length);
-
         var groupIdMappings = new List<KeyValuePair<int, GroupId>>();
         var optionIdMappings = new List<KeyValuePair<int, OptionId>>();