diff --git a/.swiftlint.yml b/.swiftlint.yml
index b7c1dca..10000ea 100644
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@@ -58,7 +58,7 @@ file_header:
                     \/\/  FirebladeECS
                     \/\/
                     \/\/  Created by .*? on \d{1,2}\/\d{1,2}\/\d{2}\.
-                    \/\/  Copyright © \d{4} Realm\. All rights reserved\.
+                    \/\/  Copyright © \d{4} Christian Treffs\. All rights reserved\.
                     \/\/
 identifier_name:
   excluded:
diff --git a/Sources/FirebladeECS/Family.swift b/Sources/FirebladeECS/Family.swift
index 4039441..e40a2e5 100644
--- a/Sources/FirebladeECS/Family.swift
+++ b/Sources/FirebladeECS/Family.swift
@@ -25,7 +25,7 @@ public final class Family {
 	}
 
 	var memberIds: UniformEntityIdentifiers {
-		return nexus!.members(of: self)
+		return nexus?.members(of: self) ?? UniformEntityIdentifiers()
 	}
 }
 
diff --git a/Sources/FirebladeECS/Nexus+Component.swift b/Sources/FirebladeECS/Nexus+Component.swift
index 931fb68..9331aad 100644
--- a/Sources/FirebladeECS/Nexus+Component.swift
+++ b/Sources/FirebladeECS/Nexus+Component.swift
@@ -43,12 +43,12 @@ extension Nexus {
 		if componentsByType[componentId] == nil {
 			componentsByType[componentId] = UniformComponents()
 		}
-		componentsByType[componentId]!.add(component, at: entityIdx)
+		componentsByType[componentId]?.add(component, at: entityIdx)
 
 		// assigns the component id to the entity id
-		if componentIdsByEntity[entityIdx] != nil {
-			let endIndex: Int = componentIdsByEntity[entityIdx]!.count
-			componentIdsByEntity[entityIdx]!.append(componentId) // Amortized O(1)
+		if let compIds = componentIdsByEntity[entityIdx] {
+			let endIndex: Int = compIds.count
+			componentIdsByEntity[entityIdx]?.append(componentId) // Amortized O(1)
 			componentIdsByEntityLookup[hash] = endIndex
 		} else {
 			componentIdsByEntity[entityIdx] = ComponentIdentifiers(arrayLiteral: componentId)
diff --git a/Sources/FirebladeECS/Nexus+Family.swift b/Sources/FirebladeECS/Nexus+Family.swift
index 4c84d58..146a855 100644
--- a/Sources/FirebladeECS/Nexus+Family.swift
+++ b/Sources/FirebladeECS/Nexus+Family.swift
@@ -131,7 +131,7 @@ private extension Nexus {
 		if familyMembersByTraitHash[traitHash] == nil {
 			familyMembersByTraitHash[traitHash] = UniformEntityIdentifiers()
 		}
-		familyMembersByTraitHash[traitHash]!.add(entityId, at: entityIdx)
+		familyMembersByTraitHash[traitHash]?.add(entityId, at: entityIdx)
 	}
 
 	func remove(from traitHash: FamilyTraitSetHash, entityId: EntityIdentifier, entityIdx: EntityIndex) {
diff --git a/Sources/FirebladeECS/SparseSet.swift b/Sources/FirebladeECS/SparseSet.swift
index e9fc996..b7478d8 100644
--- a/Sources/FirebladeECS/SparseSet.swift
+++ b/Sources/FirebladeECS/SparseSet.swift
@@ -46,20 +46,27 @@ public class SparseSet<Element>: UniformStorage, Sequence {
 		guard has(index) else {
 			return nil
 		}
-		return dense[sparse[index]!]!.value
+		guard let sIdx = sparse[index] else {
+			return nil
+		}
+		return dense[sIdx]?.value
 	}
 
 	public func remove(at index: Index) {
 		guard has(index) else {
 			return
 		}
-		let removeIdx: DenseIndex = sparse[index]!
+		guard let removeIdx: DenseIndex = sparse[index] else {
+			return
+		}
 		let lastIdx: DenseIndex = count - 1
 		dense.swapAt(removeIdx, lastIdx)
 		sparse[index] = nil
-		let swapped: Pair = dense[removeIdx]!
+		guard let swapped: Pair = dense[removeIdx] else {
+			return
+		}
 		sparse[swapped.key] = removeIdx
-		_ = dense.popLast()!!
+		dense.removeLast()
 		size -= 1
 		if size == 0 {
 			clear(keepingCapacity: false)