diff --git a/src/main/kotlin/net/shadowfacts/phycon/component/NetworkStackDispatcher.kt b/src/main/kotlin/net/shadowfacts/phycon/component/NetworkStackDispatcher.kt
index dbc61f8..4cadc5f 100644
--- a/src/main/kotlin/net/shadowfacts/phycon/component/NetworkStackDispatcher.kt
+++ b/src/main/kotlin/net/shadowfacts/phycon/component/NetworkStackDispatcher.kt
@@ -29,10 +29,10 @@ interface NetworkStackDispatcher<Insertion: NetworkStackDispatcher.PendingInsert
 	}
 
 	fun handleCapacity(packet: CapacityPacket) {
-		val insertion = pendingInsertions.firstOrNull {
-			ItemStackUtil.areEqualIgnoreAmounts(packet.stack, it.stack)
-		}
-		if (insertion != null) {
+		pendingInsertions.firstOrNull { insertion ->
+			ItemStackUtil.areEqualIgnoreAmounts(packet.stack, insertion.stack) &&
+					insertion.results.none { it.second.ipAddress == packet.source }
+		}?.also { insertion ->
 			insertion.results.add(packet.capacity to packet.stackReceiver)
 			if (insertion.isFinishable(this)) {
 				val remaining = finishInsertion(insertion)