diff --git a/classes/deck/deck.gd b/classes/deck/deck.gd
index f57299f..cfac86e 100644
--- a/classes/deck/deck.gd
+++ b/classes/deck/deck.gd
@@ -357,15 +357,14 @@ func copy_nodes(nodes_to_copy: Array[String]) -> Dictionary:
 				if to_node not in nodes_to_copy:
 					(d.nodes[node].outgoing_connections[from_port] as Dictionary).erase(to_node)
 
-		var outgoing_is_empty: bool = true
+		var keys_to_erase := []
 		for from_port: int in d.nodes[node].outgoing_connections:
-			if not (d.nodes[node].outgoing_connections[from_port] as Dictionary).is_empty():
-				outgoing_is_empty = false
-				break
-		
-		if outgoing_is_empty:
-			d.nodes[node].outgoing_connections = {}
-		
+			if (d.nodes[node].outgoing_connections[from_port] as Dictionary).is_empty():
+				keys_to_erase.append(from_port)
+
+		for key in keys_to_erase:
+			(d.nodes[node].outgoing_connections as Dictionary).erase(key)
+
 		var incoming_connections: Dictionary = d.nodes[node].incoming_connections.duplicate(true)
 
 		for to_port: int in incoming_connections:
@@ -373,14 +372,14 @@ func copy_nodes(nodes_to_copy: Array[String]) -> Dictionary:
 				if from_node not in nodes_to_copy:
 					(d.nodes[node].incoming_connections[to_port] as Dictionary).erase(from_node)
 		
-		var incoming_is_empty: bool = true
+		keys_to_erase.clear()
 		for to_port: int in d.nodes[node].incoming_connections:
-			if not (d.nodes[node].incoming_connections[to_port] as Dictionary).is_empty():
-				incoming_is_empty = false
-				break
-		
-		if incoming_is_empty:
-			d.nodes[node].incoming_connections = {}
+			if (d.nodes[node].incoming_connections[to_port] as Dictionary).is_empty():
+				keys_to_erase.append(to_port)
+
+		for key in keys_to_erase:
+			(d.nodes[node].incoming_connections as Dictionary).erase(key)
+		keys_to_erase.clear()
 
 	for node: Dictionary in d.nodes.values().slice(1):
 		node.position.x = node.position.x - d.nodes.values()[0].position.x
diff --git a/classes/deck/deck_node.gd b/classes/deck/deck_node.gd
index f6a0615..e6e661b 100644
--- a/classes/deck/deck_node.gd
+++ b/classes/deck/deck_node.gd
@@ -14,7 +14,7 @@ var name: String
 ## [code]Dictionary[int -> output port, Dictionary[String -> DeckNode#_id, Array[int -> input port]]][/code]
 var outgoing_connections: Dictionary
 ## A map of incoming connections to this node, in the format[br]
-## [code]Dictionary[int -> input port, [Dictionary[String -> DeckNode#_id, int -> output port]][/code]
+## [code]Dictionary[int -> input port, Dictionary[String -> DeckNode#_id, int -> output port][/code]
 var incoming_connections: Dictionary
 
 ## A list of [Port]s on this node.