diff --git a/Sources/FirebladeECS/Nexus+Component.swift b/Sources/FirebladeECS/Nexus+Component.swift
index 5ed4bd0..a67ca15 100644
--- a/Sources/FirebladeECS/Nexus+Component.swift
+++ b/Sources/FirebladeECS/Nexus+Component.swift
@@ -28,11 +28,8 @@ public extension Nexus {
 
         /// test if component is already assigned
         guard !has(componentId: componentId, entityIdx: entityIdx) else {
-            // FIXME: this is still open to debate
-            // a) we replace the component
-            // b) we copy the properties
-            // c) we assert fail
             report("ComponentAdd collision: \(entityIdx) already has a component \(component)")
+            assertionFailure("ComponentAdd collision: \(entityIdx) already has a component \(component)")
             return
         }
 
diff --git a/Tests/FirebladeECSTests/NexusTests.swift b/Tests/FirebladeECSTests/NexusTests.swift
index 133177e..f074b32 100644
--- a/Tests/FirebladeECSTests/NexusTests.swift
+++ b/Tests/FirebladeECSTests/NexusTests.swift
@@ -70,7 +70,7 @@ class NexusTests: XCTestCase {
 		let p0 = Position(x: 1, y: 2)
 
 		e0.assign(p0)
-		e0.assign(p0)
+        // component collision: e0.assign(p0)
 
 		XCTAssert(e0.hasComponents)
 		XCTAssert(e0.numComponents == 1)