diff --git a/main.lua b/main.lua
index 020e140..2331929 100644
--- a/main.lua
+++ b/main.lua
@@ -426,9 +426,11 @@ local function populateThrusterValues()
             local subnetworkId = peripheral.wrap(thruster.name).getSubnetworkAnchorId()
             for _, transmissionType in ipairs(TransmissionTypes) do
                 local transmissions = peripheral.find(transmissionType)
-                for _, transmission in ipairs(transmissions) do
-                    if transmission.getSelfId() == subnetworkId then
-                        thruster.transmission = peripheral.getName(transmission)
+                if transmissions ~= nil and transmissions[1] ~= nil then
+                    for _, transmission in ipairs(transmissions) do
+                        if transmission.getSelfId() == subnetworkId then
+                            thruster.transmission = peripheral.getName(transmission)
+                        end
                     end
                 end
             end